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Dissertations / Theses on the topic 'Ising spins'

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Published: 4 June 2021

Last updated: 16 February 2022

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1

Godoy, Maurício. "Comportamento dinâmico de modelos de spins mistos." Florianópolis, SC, 2004. http://repositorio.ufsc.br/xmlui/handle/123456789/86636.

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Tese (doutorado) - Universidade Federal de Santa Catarina. Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em Física.<br>Made available in DSpace on 2012-10-21T09:02:36Z (GMT). No. of bitstreams: 1 201220.pdf: 1117800 bytes, checksum: 3e9aa6c23e2d84fc294945607454ec46 (MD5)

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Harris, Martin Guy. "Random surfaces : multiple Ising spins coupled to 2d quantum gravity." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260140.

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3

Mari, Pierre-Olivier. "Etude numérique de verres de spins Ising en dimension trois." Paris 11, 2001. http://www.theses.fr/2001PA112364.

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Les verres de spins sont des matériaux magnétiques qui présentent à basse température un ensemble de propriétés inédites dont certaines sont caractéristiques de la combinaison du désordre et de contraintes conflictuelles. La modélisation aisée de tels systèmes magnétiques en vue d'un traitement analytique ou numérique a fait du verre de spins l'archétype des systèmes désordonnés. Toutefois, la complexité et l'étendue du savoir accumulé sur ces systèmes et les matériaux vitreux en général cachent une réalité frustrante: la compréhension de la physique qui les gouverne et la connaissance de la n

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Brito, Rejane Alves de. "Método variacional de Bogoliubov Aplicado a modelos de Spins: Ising e Blume-Capel." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9830.

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Submitted by Leonardo Cavalcante (leo.ocavalcante@gmail.com) on 2018-04-30T14:54:08Z No. of bitstreams: 1 Arquivototal.pdf: 981715 bytes, checksum: 76897646d0930b35e6a38674ac2d9ec2 (MD5)<br>Made available in DSpace on 2018-04-30T14:54:08Z (GMT). No. of bitstreams: 1 Arquivototal.pdf: 981715 bytes, checksum: 76897646d0930b35e6a38674ac2d9ec2 (MD5) Previous issue date: 2017-03-03<br>Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq<br>The spin-1=2 and spin-1 Ising models, as well as the spin-1 Blume-Capel model have been studied in one-, two-, and three-dimens

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Godoy, Maurício. "Dinâmica do modelo de Ising ferromagnetico com spins mistos o = 1/2 e S= 1 /." Florianópolis, SC, 1999. http://repositorio.ufsc.br/xmlui/handle/123456789/80472.

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Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.<br>Made available in DSpace on 2012-10-18T14:58:08Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-09T03:54:45Z : No. of bitstreams: 1 144132.pdf: 1639773 bytes, checksum: a5105f67864d1062154a319632c45e80 (MD5)

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Mirza, Behrouz. "On the transition between crystalline and gravitational phases in two dimensional theories with matter fields." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318930.

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7

Souza, Estefano Alves de. "Simulação perfeita e aproximações de alcance finito em sistemas de spins com interações de longo alcance." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-27052013-192003/.

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Nosso objeto de estudo são os sistemas de spins com interações de longo alcance; em particular, estamos interessados em sistemas cuja probabilidade invariante é o modelo de Ising em A^S, onde A = {-1, 1} é o espaço de spins e S = Z^d é o espaço de sítios. Apresentamos dois resultados originais que são consequências da aplicação de algoritmos de simulação perfeita e de acoplamento no contexto da construção deste tipo de sistemas e de suas respectivas probabilidades invariantes.<br>Our object of interest are spin systems with long-range interactions. As a special case, we are interested in syste

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8

Gabriel, Roberto Vila. "Representações gráficas para sistemas de spins com presença de campo externo : algumas relações em teoria de probabilidades." reponame:Repositório Institucional da UnB, 2016. http://repositorio.unb.br/handle/10482/22471.

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Tese (doutorado)—Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Matemática, 2016.<br>Submitted by Albânia Cézar de Melo (albania@bce.unb.br) on 2016-12-23T12:19:10Z No. of bitstreams: 1 2016_RobertoVilaGabriel.pdf: 9781683 bytes, checksum: 3fe0f89ca8df223ebdacbaf2a11fb635 (MD5)<br>Approved for entry into archive by Raquel Viana(raquelviana@bce.unb.br) on 2017-02-10T21:03:00Z (GMT) No. of bitstreams: 1 2016_RobertoVilaGabriel.pdf: 9781683 bytes, checksum: 3fe0f89ca8df223ebdacbaf2a11fb635 (MD5)<br>Made available in DSpace on 2017-02-10T21:03:00Z (GMT). No. of bitstreams:

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BOUBCHEUR, EL HASSANE. "Transition de phase dans des systemes de spins : effets de la frustration et du couplage magnetoelastique." Cergy-Pontoise, 1998. http://www.theses.fr/1998CERG0053.

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La these traite les transitions de phase dans des systemes de spins avec interaction en competition par la simulation monte carlo (mc) avec la technique de l'histogramme. Les exposants critiques ont ete calcules a partir des lois d'echelle en taille finie. La premiere partie est consacree aux effets de la frustration dans le modele xy. L'etude des diagrammes de phase et la nature des transitions ont ete menees successivement sur le reseau triangulaire antiferromagnetique (3d), le reseau en damier (3d) et le reseau carre (2d). Parmi les resultats obtenus, on note, suivant le parametre de frustr

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10

Sakly, Nahed. "Investigations structurale et physique du système d'oxydes à chaînes de spins Ising (Sr, Ca)1+xCoxMn1-xO3." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMC232.

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Ce manuscrit présente l’étude expérimentale des propriétés structurales et physiques d’une série de composés à chaînes de spins Sr4−xCaxCoMn2O9, appartenant à la famille d’oxydes A1+X(A’XB1−X)O3. Dans cette série, les chaînes 1D sont constituées des octaèdres MnO6 et prismes trigonaux CoO6 reliés par les faces, et réparties sur un réseau triangulaire avec un couplage antiferromagnétique entre elles. Ces chaînes présentent une forte anisotropie magnétique de type Ising provenant du cation Co2+ (HS, 3d7, S = 3/2). D’abord, l'étude structurale de ces chaînes révèle qu’elles peuvent être incommens

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Faure, Quentin. "Transitions de phases quantiques dans le composé quasi-1D antiferromagnétique de type Ising BaCo2V2O8." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY063/document.

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Ce manuscrit présente l’étude de transitions de phase quantiques dans l’oxyde BaCo2V2O8, un système antiferromagnétique quasi-unidimensionnel constitué de chaînes d’ions cobalt portant un spin effectif S = 1/2 caractérisé par une forte anisotropie de type Ising. Lors de ce travail, nous avons étudié les propriétés statiques et dynamiques de BaCo2V2O8 sous l’effet de différents paramètres physiques.Notre première étude a porté sur l’effet d’un champ magnétique transverse, i.e. appliqué perpendiculairement à l’axe Ising. Il a été proposé que lors de l’application d’un tel champ, un champ magnéti

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Chen, Linxiao. "Cartes planaires aléatoires couplées aux systèmes de spins." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS096/document.

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Cette thèse vise à améliorer notre compréhension des cartes planaires aléatoires décorées par les modèles de physique statistique. On examine trois modèles particuliers à l'aide des outils provenant de l'analyse, de la combinatoire et des probabilités. Dans une perspective géométrique, on se concentre sur les propriétés des interfaces et les limites locales des cartes aléatoires décorées. Le premier modèle consiste en une famille de quadrangulations aléatoires du disque décorées par un modèle de boucles O(n). Après avoir complété la preuve de son diagramme de phase initiée par [BBG12c] (chap.

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Litaiff, Fabian Cardoso. "Modelos de spins geometricamente frustrados: transição de fase e estruturas de platores." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/4963.

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Made available in DSpace on 2016-06-02T20:15:29Z (GMT). No. of bitstreams: 1 5202.pdf: 3904832 bytes, checksum: c623a581c3cdb03d9cc81fc16ecef935 (MD5) Previous issue date: 2013-04-08<br>Universidade Federal de Minas Gerais<br>This thesis presents a study of the magnetization plateau and the phenomenon of geometrical frustration in spin systems applied to lattices with triangular structure, as well as the results achieved by applying the differential operator technique of the Ising and Heisenberg models with external magnetic field applied to the easy magnetization axis z, their phase diagram

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Amazonas, Márcio Andrei Sousa. "Desenvolvimento de um algoritmo numérico na técnica do operador diferencial : aplicações em modelos de spins." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/8922.

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Submitted by Aelson Maciera (aelsoncm@terra.com.br) on 2017-06-28T18:00:24Z No. of bitstreams: 1 TeseMASA.pdf: 2952958 bytes, checksum: 7fd6c19f5dbc2b559baf911ba11a9787 (MD5)<br>Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-08-07T18:17:28Z (GMT) No. of bitstreams: 1 TeseMASA.pdf: 2952958 bytes, checksum: 7fd6c19f5dbc2b559baf911ba11a9787 (MD5)<br>Approved for entry into archive by Ronildo Prado (ronisp@ufscar.br) on 2017-08-07T18:17:35Z (GMT) No. of bitstreams: 1 TeseMASA.pdf: 2952958 bytes, checksum: 7fd6c19f5dbc2b559baf911ba11a9787 (MD5)<br>Made available in

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Vieira, Selma Rozane. "Efeitos de campos aleat?rios e de anisotropias em vidros de spins." Universidade Federal do Rio Grande do Norte, 1999. http://repositorio.ufrn.br:8080/jspui/handle/123456789/16583.

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Made available in DSpace on 2014-12-17T15:14:54Z (GMT). No. of bitstreams: 1 SelmaRV_TESE.pdf: 3758039 bytes, checksum: 6ed2e51c943660db7972e9c51961c80a (MD5) Previous issue date: 1999-06-18<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Ising and m-vector spin-glass models are studied, in the limit of infinite-range in-teractions, through the replica method. First, the m-vector spin glass, in the presence of an external uniform magnetic field, as well as of uniaxial anisotropy fields, is consi-dered. The effects of the anisotropics on the phase diagrams, and in particular

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Homrighausen, Ingo [Verfasser]. "Quantum quench dynamics in the transverse field Ising model of fully connected spins : An entanglement based study beyond mean field / Ingo Homrighausen." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/123154208X/34.

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17

Maria, Marco Aurélio Euflauzino [UNESP]. "Propriedades magnéticas do modelo de Ising bidimensional em uma rede bipartida de spins 1/2 e 1: um estudo de ferrimagnetismo com vacâncias." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/88503.

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Made available in DSpace on 2014-06-11T19:23:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-06-15Bitstream added on 2014-06-13T20:50:25Z : No. of bitstreams: 1 maria_mae_me_bauru.pdf: 534060 bytes, checksum: 9cc6f4499e6abb250f5041a9db4d905a (MD5)<br>O composto 'La IND. 2'Cu'O IND. 4' é um isolante antiferromagnético que tem sido amplamente estudado [1]. Por outro lado, a manganita LaMa'O IND. 3'[2] é o composto que dá origem a uma grande família de sistemas magnéticos como os materiais que apresentam a magnetorresistência colossal e o ordenamento de carga [3]. A substituição de ío

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Maria, Marco Aurélio Euflauzino. "Propriedades magnéticas do modelo de Ising bidimensional em uma rede bipartida de spins 1/2 e 1 : um estudo de ferrimagnetismo com vacâncias /." Bauru : [s.n.], 2009. http://hdl.handle.net/11449/88503.

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Orientador: André Luiz Malvezzi<br>Banca: José Varalda<br>Banca: José Humberto Dias da Silva<br>O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp<br>Resumo: O composto 'La IND. 2'Cu'O IND. 4' é um isolante antiferromagnético que tem sido amplamente estudado [1]. Por outro lado, a manganita LaMa'O IND. 3'[2] é o composto que dá origem a uma grande família de sistemas magnéticos como os materiais que apresentam a magnetorresistência colossal e o ordenamento de carga [3].

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Platini, Thierry. "Chaînes de spins quantiques hors de l'équilibre." Phd thesis, Université Henri Poincaré - Nancy I, 2008. http://tel.archives-ouvertes.fr/tel-00439896.

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Les travaux exposés dans ce manuscrit sont consacrés à l'étude de la dynamique hors équilibre de chaînes quantiques décrites par le modèle XY. Nous commençons par considérer la dynamique unitaire obtenue par la mise en contact de sous-systèmes voisins thermalisés à des températures différentes. L'état initial de la chaîne est alors inhomogène et la dynamique tend à l'homogénéisation. Lorsque le système est initialement divisé en deux sous-systèmes semi-infini préparés aux températures $T_b=\infty$ et $T_s$ nous obtenons analytiquement la fonction de Green associée à la dynamique du courant et

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Freitas, Augusto dos Santos. "Estudo de sistemas magnéticos desordenados via modelos clássicos de spins por meio de técnicas analíticas." Universidade Federal de Sergipe, 2014. https://ri.ufs.br/handle/riufs/5250.

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In this work, we study the magnetic properties of classical spin models, namely spin-2 Ising model with site dilution and mixed-bond spin 1/2 Ising model by means of the Effective Field Theory (EFT), with applications to describe of the magnetic properties of Fe-Al, Fe-Mn and Fe-Mn-Al alloys. In here, we obtain the van der Waerden identity for a generic spin value S, for example, to be used in the description of spin-2 Ising model and expressions were used to phenomenological description of the dependence of exchange interaction on the concentration of aluminum and manganese atoms. Behav

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Jassionnesse, Lionel. "Contrôle optimal et métriques de Clairaut-Liouville avec applications." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS047/document.

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Le travail de cette thèse porte sur l'étude des lieux conjugué et de coupure de métriques riemanniennes ou pseudo-riemanniennes en dimension 2. On se place du point de vue du contrôle optimal pour appliquer le principe du maximum de Pontryagin afin de caractériser les extrémales des problèmes considérés.On va utiliser des méthodes géométriques, numériques et d'intégrabilité pour étudier des métriques de Clairaut-Liouville ou de Liouville sur la sphère. Dans le cas dégénéré de révolution, l'étude de l'ellipsoïde utilise des méthodes géométriques pour déterminer le lieu de coupure et la nature d

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Atas, Yasar Yilmaz. "Quelques aspects du chaos quantique dans les systèmes de N-corps en interaction : chaînes de spins quantiques et matrices aléatoires." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112221/document.

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Mon travail de thèse est consacré à l’étude de quelques aspects de la physique quantique des systèmes quantiques à N corps en interaction. Il est orienté vers l’étude des chaînes de spins quantiques. Je me suis intéressé à plusieurs questions relatives aux chaînes de spins quantiques, du point de vue numérique et analytique à la fois. J'aborde en particulier les questions relatives à la structure des fonctions d'onde, la forme de la densité d'états et les propriétés spectrales des Hamiltoniens de chaînes de spins. Dans un premier temps, je présenterais très rapidement les techniques numériques

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Sarvezuk, Paulo Willian Carvalho. "Estudo do sistema quase unidimensional AxA'1-xNb2O6 (A e A'=Ni, Fe e Co) : preparação e caracterização das propriedades e estruturas magnéticas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/49345.

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Cette étude expérimentale est consacrée à la structure cristalline et aux propriétés magnétiques des phases orthorhombiques ANb2O6 (A = métaux magnétiques) qui ont retenues notre attention en tant que système Ising modèle quasi 1D. Ce comportement magnétique original de basse dimension résulte à la fois de la force des interactions magnétiques le long des chaînes d'atomes magnétiques quasi-unidimensionnelles, et à la faiblesse des interactions entre les chaînes qui sont de nature antiferromagnétique. Lorsque ces composés sont ordonnés l’ensemble de ces interactions inter et intra chaîne condui

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Hystad, Grethe. "Periodic Ising Correlations." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/196130.

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We consider the finite two-dimensional Ising model on a lattice with periodic boundaryconditions. Kaufman determined the spectrum of the transfer matrix on the finite,periodic lattice, and her derivation was a simplification of Onsager's famous result onsolving the two-dimensional Ising model. We derive and rework Kaufman's resultsby applying representation theory, which give us a more direct approach to computethe spectrum of the transfer matrix. We determine formulas for the spin correlationfunction that depend on the matrix elements of the induced rotation associated withthe spin operator.

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Feng, Shuangtong. "Efficient Parallelization of 2D Ising Spin Systems." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36263.

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The problem of efficient parallelization of 2D Ising spin systems requires realistic algorithmic design and implementation based on an understanding of issues from computer science and statistical physics. In this work, we not only consider fundamental parallel computing issues but also ensure that the major constraints and criteria of 2D Ising spin systems are incorporated into our study. This realism in both parallel computation and statistical physics has rarely been reflected in previous research for this problem. <p> In this thesis,we designed and implemented a variety of parallel algorit

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Canning, Andrew Magnus. "Ising spin models of partially connected neural networks." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/13304.

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Leite, Filho Raimundo Valmir. "Impurezas Magnéticas em Ferromagnetos de Ising com Campo Transverso." reponame:Repositório Institucional da UFC, 2005. http://www.repositorio.ufc.br/handle/riufc/12930.

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LEITE FILHO, Raimundo Valmir. Impurezas Magnéticas em Ferromagnetos de Ising com Campo Transverso. 2005. 109 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2005.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-06-23T18:17:55Z No. of bitstreams: 1 2005_tese_rvleitefilho.pdf: 656815 bytes, checksum: af381150f33bff4b9142c5eeef4e117b (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-06-23T21:06:49Z (GMT) No. of bitstreams: 1 2005_tes

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Cochran, Christopher S. "Even-number spin correlations on two-dimensional Ising lattice structures." Virtual Press, 2002. http://liblink.bsu.edu/uhtbin/catkey/1237760.

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Many physical systems can be represented by a regular arrangement of molecules in a lattice structure. Knowing how neighboring molecules in the lattice interact with one another can give great insight into a material's macroscopic behavior. A very popular and effective means of investigating these microscopic interactions is the Ising Model. This model, suggested first by Wilhelm Lenz in 1920 and later expanded by Ernst Ising in 1925, is based on the assumptions that each molecule in a lattice structure can be represented by its spin value (+l or -1) and that only nearest neighbors contribute

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BERNARDI, LORENZO. "Dynamique et exposants critiques dans les verres de spin ising." Paris 11, 1996. http://www.theses.fr/1996PA112314.

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Le sujet de cette these porte sur les verres de spin ising, qui sont les archetypes des systemes complexes en physique des solides. Bien que la phase verre de spin presente des aspects remarquables tels que le vieillissement nous nous sommes plutot interesse au comportement des verres de spin a la transition. Dans la premiere partie de cette these les verres de spin sont introduit d'un point de vue experimental, afin de degager les concepts clefs, a savoir la frustration et le desordre. Muni de ces concepts il est alors possible d'aborder les modeles theoriques. Enfin pour conclure la partie i

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Mehrafarin, M. "Some topics in the theory of mixed spin ising models." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377142.

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Nakamura, Y., and J. W. Tucker. "Monte Carlo Study of a Mixed Spin-1 and Spin-3/2 Ising Ferromagnet." IEEE, 2002. http://hdl.handle.net/2237/7158.

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Hernandez, Hernandez Fabio 1990. "Estados de impureza no modelo de Ising quântico." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/322412.

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Orientador: Guillermo Gerardo Cabrera Oyarzún<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-30T18:12:28Z (GMT). No. of bitstreams: 1 Hernandez_FabioHernandez_M.pdf: 2178317 bytes, checksum: 00e18623b835112b2aa5c348e4651b65 (MD5) Previous issue date: 2016<br>Resumo: A descrição da dinâmica quântica de sistemas de muitos corpos é um ingrediente chave para computação e simulações quânticas. No presente projeto, estudamos a dinâmica de cadeias de spin na presença de impurezas ou defeitos. O sistema de Ising

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Silva, Romero Tavares da. "ALEATORIEDADE EM MODELOS DE ISING." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-22052012-133450/.

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Na primeira parte deste trabalho propomos uma aproximacão de campo médio dinâmico para analisar modelos de Ising com elementos e aleatoriedade definidos por distribuicões de probabilidades discretas. Analisamos o modelo com campo aleatório (S = 1/2), com interações aleatórias (S = 1/2), com diluição de sítios (S = 1/2) e com anisotropia aleatória (S = 1), obtendo os respectivos diagramas de fases. Na segunda parte analisamos modelos de vidros de spin (S= 3/2) com anisotropia de campo cristalino. Estudamos o modelo de van Hemmen, e o modelo clássico à la Sherrington e Kirkpatrick dentro do e

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Khoshbakht, Hamid [Verfasser]. "The two-dimensional Ising spin glass at zero temperature / Hamid Khoshbakht." Mainz : Universitätsbibliothek Mainz, 2019. http://d-nb.info/1179820118/34.

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Filho, Raimundo Valmir Leite. "Impurezas MagnÃticas em Ferromagnetos de Ising com Campo Transverso." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2917.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>FundaÃÃo de Amparo Ã Pesquisa do Estado do CearÃ<br>O formalismo de funÃÃes de Green Ã usado para calcular o espectro de excitaÃÃes associados a impurezas magnÃticas implantadas em um filme ferromagnÃtico descrito pelo modelo de Ising com campo transverso. AtravÃs do mÃtodo da equaÃÃo de movimento expressÃes explÃcitas para as funÃÃes de Green sÃo determinadas para um ferromagneto sem impurezas. A funÃÃo de Green para um filme ferromagnÃtico contendo impurezas Ã obtida atravÃs da equaÃÃo de Dyson. O espectro de ondas de spin rela

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Kenneway, Debra A. "An Investigation of the Two-Dimensional Ising Spin Glass Using Information Theoretic Measures." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/KennewayDA2005.pdf.

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Lima, Karlla Adriana Pereira de. "Vidro de spin ising no limiar da percolação: comportamento dinâmico e histerese." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/6711.

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Made available in DSpace on 2014-06-12T18:06:59Z (GMT). No. of bitstreams: 2 arquivo7771_1.pdf: 2743731 bytes, checksum: 9ef94d6fc0767a126397c80461610401 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2006<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Neste trabalho são apresentados os resultados da dinâmica do sistema FexZn1-xF2 em sua fase vidro de spin próximo ao limiar da percolação,a x = 0.25 ? xp = 0.24, por meio do estudo da autocorrelação temporal de spin via simulação Monte Carlo. Foram realizados vários

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Sakellariou, Jason. "Inverse inference in the asymmetric Ising model." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00869738.

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Recent experimental techniques in biology made possible the acquisition of overwhelming amounts of data concerning complex biological networks, such as neural networks, gene regulation networks and protein-protein interaction networks. These techniques are able to record states of individual components of such networks (neurons, genes, proteins) for a large number of configurations. However, the most biologically relevantinformation lies in their connectivity and in the way their components interact, information that these techniques aren't able to record directly. The aim of this thesis is to

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Rosa, Priscila Ferrari Silveira 1988. "Dinâmica quântica de estados de impurezas em cadeias de spin." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277877.

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Orientador: Guillermo Gerardo Cabrera Oyarzún<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física "Gleb Wataghin"<br>Made available in DSpace on 2018-08-16T15:57:09Z (GMT). No. of bitstreams: 1 Rosa_PriscilaFerrariSilveira_M.pdf: 3441309 bytes, checksum: ac0fe3faa7642e9a7ef8330049e33761 (MD5) Previous issue date: 2010<br>Resumo: A descrição da dinâmica quântica de sistemas de muitos corpos é um ingrediente chave para a computação quântica. No presente projeto, propomos o estudo da dinâmica em cadeias finitas de spin 1/2 na presença de impurezas ou defeitos. O m

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Chiruta, Daniel-Gabriel. "The analysis of hysteretic behavior in bistable spin transition nanomaterials and its applications towards nanoelectronics devices." Versailles-St Quentin en Yvelines, 2014. http://www.theses.fr/2014VERS0020.

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L’objectif principal de ce travail est d’appliquer des méthodes exactes (matrice de transfert) ou semi-exactes (en utilisant des simulations Monte Carlo avec l’algorithme de l’échantillonnage entropique) à l’étude du comportement des matériaux moléculaires. Nous avons utilisé le modèle type-Ising en tenant compte des interactions à courte et à longue portée afin de simuler la réponse à des effets extérieurs dans des composés à transition de spin de taille macroscopique ainsi que des tailles nanométriques. Grâce à leur bistabilité ces composés à transition de spin sont potentiellement utilisabl

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Liers, Frauke. "Contributions to determining exact ground states of ising spin glasses and to their physics." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972890793.

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Gulener, Fatih. "Etude experimentale de la relaxation des moments magnetiques dans un verre de spin ising." Paris 11, 2001. https://tel.archives-ouvertes.fr/tel-00001917.

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Nous etudions principalement les proprietes dynamiques dans le verre de spin quasi-ising metallique fe xtis 2 ou les atomes de fer sont inseres par intercalation dans une structure en feuillets. Des mesures d'aimantation statique au squid et de caracterisation structurale par diffraction de rayons x (diagramme de poudre, affinement rietveld) sont presentees afin de comprendre le diagramme de phase. Nous etudions la forme de la relaxation de spin en fonction de la temperature et de la concentration d'impuretes x. L'interet de travailler avec ce type de materiau tres anisotrope est de se placer

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Tartas, Jean. "Computer simulation study of domain growth in the two-dimensional ferromagnetic spin-flip Ising model." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64103.

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Nikoletopoulos, Theodore. "Equilibrium and non-equilibrium statistical mechanics of disordered Ising spin models with mixed range interactions." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412486.

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Morais, Junior Carlos Alberto Vaz de. "Transições de primeira ordem no modelo vidro de spin ising fermiônico em um campo transverso." Universidade Federal de Santa Maria, 2006. http://repositorio.ufsm.br/handle/1/9201.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The present work analyzes the fermionic Ising spin glass model in a transverse magnetic field. The problem is written in the Grand Canonical ensemble with the spin operators represented by bilinear combinations of fermionic fields. The transverse field is a spin "flip" mechanism and inserts quantum fluctuations, which can lead the transition temperature Tj to quantum critical point (QCP). In this case, the phase transition from spin glass to paramagnetic phases occurs in T = o. On the other hand, charge fluctuations controlled by c

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BRITO, Janete Batista de. "Histerese e irreversibilidade em vidro de spin ising próximo ao limiar de percolação: FexZn1-xF2." Universidade Federal de Pernambuco, 2003. https://repositorio.ufpe.br/handle/123456789/6874.

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Made available in DSpace on 2014-06-12T18:08:02Z (GMT). No. of bitstreams: 2 arquivo8004_1.pdf: 4568730 bytes, checksum: 59b8a548fa5fc647bcee9fe6d1b3e888 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2003<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Na presente dissertação realizamos estudos através de simulação computacional, utilizando o método Monte Carlo (MC) do antiferromagneto (AF) diluído FexZn1−xF2, próximo da região de percolação (x = 0.24) e na presença de um campo magnético externo H. O sistema

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47

Gulener, Fatih. "Etude expérimentale et théorique de la relaxation des moments magnétiques dans un verre de spin Ising." Phd thesis, Université Paris Sud - Paris XI, 2001. http://tel.archives-ouvertes.fr/tel-00001917.

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Nous étudions principalement les propriétés dynamiques dans le verre de spin quasi-Ising métallique FexTiS2 où les atomes de fer sont insérés par intercalation dans une structure en feuillets. Des mesures d'aimantation statique au SQUID et de caractérisation structurale par diffraction de rayons X (diagramme de poudre, affinement Rietveld) sont présentées afin de comprendre le diagramme de phase. Nous étudions la forme de la relaxation de spin en fonction de la température et de la concentration d'impuretés x. L'intérêt de travailler avec ce type de matériau très anisotrope est de se placer da

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48

Nakamura, Yasuyuki. "Existence of a compensation temperature of a mixed spin-2 and spin-5/2 Ising ferrimagnetic system on a layered honeycomb lattice." The American Physical Society, 2000. http://hdl.handle.net/2237/7150.

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LIMA, Karlla Adriana Pereira de. "Efeito do campo magnético na fase ordenada de um vidro de Spin Ising no limiar da percolação." Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/11166.

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Submitted by Danielle Karla Martins Silva (danielle.martins@ufpe.br) on 2015-03-06T14:59:07Z No. of bitstreams: 2 Tese_Final_Karlla_Adriana.pdf: 7771602 bytes, checksum: 6893c6258f3b4f043524cf6b9d8c3566 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)<br>Made available in DSpace on 2015-03-06T14:59:07Z (GMT). No. of bitstreams: 2 Tese_Final_Karlla_Adriana.pdf: 7771602 bytes, checksum: 6893c6258f3b4f043524cf6b9d8c3566 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2012<br>O efeito do campo magnético na

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Vetel, Jérôme. "Dynamique des systèmes magnétiques désordonnés de type Ising Fe0. 35Mg0. 65Br2 et Fe0. 8Mg0. 2Cl2." Toulouse, INSA, 1990. http://www.theses.fr/1990ISAT0005.

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LE MEMOIRE PRESENTE L'ETUDE DU COMPORTEMENT DYNAMIQUE DE DEUX SYSTEMES MAGNETIQUES DESORDONNES DE TYPE ISING. DANS UNE PREMIERE PARTIE, ON ANALYSE LE COMPORTEMENT CRITIQUE DYNAMIQUE DU VERRE DE SPIN 3D-ISINGFe0. 35Mg0. 65Br2. L'ETUDE DE LA DIVERGENCE DU TEMPS DE RELAXATION CARACTERISTIQUE MET EN EVIDENCE UN CROSSOVER DE DIMENSION 2D-3D QUAND LA TEMPERATURE DECROIT. ON MONTRE QUE LE COMPORTEMENT BASSE TEMPERATURE, CONFORMEMENT AUX PREDICTIONS THEORIQUES SUR LES SYSTEMES 3D ISING, EST BIEN ANALYSE PAR UNE LOI DE PUISSANCE DE T=1T#C/T ASSOCIEE A UNE TEMPERATURE DE TRANSITION FINIE T#C=1,950,05 K.

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