Academic literature on the topic 'Quantum critical point'

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Journal articles on the topic "Quantum critical point"

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Sakurai, Hiroya, Naohito Tsujii, and Eiji Takayama-Muromachi. "Quantum critical point of -." Physica B: Condensed Matter 378-380 (May 2006): 121–22. http://dx.doi.org/10.1016/j.physb.2006.01.048.

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Ramazashvili, R., and P. Coleman. "Superconducting Quantum Critical Point." Physical Review Letters 79, no. 19 (November 10, 1997): 3752–54. http://dx.doi.org/10.1103/physrevlett.79.3752.

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Bauer, E. D., D. Mixson, F. Ronning, N. Hur, R. Movshovich, J. D. Thompson, J. L. Sarrao, M. F. Hundley, P. H. Tobash, and S. Bobev. "Antiferromagnetic quantum critical point in." Physica B: Condensed Matter 378-380 (May 2006): 142–43. http://dx.doi.org/10.1016/j.physb.2006.01.053.

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Shaginyan, V. R., E. V. Kirichenko, and V. A. Stephanovich. "Quantum critical point in ferromagnet." Physica B: Condensed Matter 403, no. 5-9 (April 2008): 755–57. http://dx.doi.org/10.1016/j.physb.2007.10.223.

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Mielczarek, Jakub. "Big Bang as a Critical Point." Advances in High Energy Physics 2017 (2017): 1–5. http://dx.doi.org/10.1155/2017/4015145.

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This article addresses the issue of possible gravitational phase transitions in the early universe. We suggest that a second-order phase transition observed in the Causal Dynamical Triangulations approach to quantum gravity may have a cosmological relevance. The phase transition interpolates between a nongeometric crumpled phase of gravity and an extended phase with classical properties. Transition of this kind has been postulated earlier in the context of geometrogenesis in the Quantum Graphity approach to quantum gravity. We show that critical behavior may also be associated with a signature change in Loop Quantum Cosmology, which occurs as a result of quantum deformation of the hypersurface deformation algebra. In the considered cases, classical space-time originates at the critical point associated with a second-order phase transition. Relation between the gravitational phase transitions and the corresponding change of symmetry is underlined.
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Continentino, Mucio Amado. "Quantum critical point in heavy fermions." Brazilian Journal of Physics 35, no. 1 (March 2005): 197–203. http://dx.doi.org/10.1590/s0103-97332005000100018.

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Bruyn, John R. de, and David A. Balzarini. "Quantum effects near the liquid–vapour critical point." Canadian Journal of Physics 68, no. 4-5 (April 1, 1990): 449–53. http://dx.doi.org/10.1139/p90-069.

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We gather together a number of recent measurements of the coexistence curve and compressibility of fluids close to the critical point, and investigate the variation of the critical exponents and amplitudes as quantum effects become more important. We find that the universal critical exponents and amplitude ratios are the same for quantum fluids as for room-temperature fluids, as expected. Some of the nonuniversal critical amplitudes, however, show systematic variations as quantum effects become significant, in at least qualitative agreement with theoretical predictions.
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Watanabe, Shinji. "New Frontiers of Quantum Critical End Point." JPSJ News and Comments 8 (January 17, 2011): 12. http://dx.doi.org/10.7566/jpsjnc.8.12.

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Schlottmann, P. "Undercompensated Kondo Impurity with Quantum Critical Point." Physical Review Letters 84, no. 7 (February 14, 2000): 1559–62. http://dx.doi.org/10.1103/physrevlett.84.1559.

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Sebastian, S. E., N. Harrison, C. D. Batista, L. Balicas, M. Jaime, P. A. Sharma, N. Kawashima, and I. R. Fisher. "Dimensional reduction at a quantum critical point." Nature 441, no. 7093 (June 2006): 617–20. http://dx.doi.org/10.1038/nature04732.

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Dissertations / Theses on the topic "Quantum critical point"

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Logg, Peter William. "Superconductivity in the proximity of a quantum critical point." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/248786.

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In a many-body fermionic system, the suppression of continuous transitions to absolute zero can result in a low temperature quantum fluid which deviates strongly from typical metallic behaviour; unconventional superconductivity can be induced by the strange metal region surrounding the zero-temperature phase transition. In this thesis we focus on three systems which demonstrate a highly tunable phase transition, with the aim of pushing them toward the border of a zero-temperature phase transition, and potentially superconductivity. CeAgSb2 is a uniaxial 4f ferromagnet, where physical pressure or a transverse field may be used to tune the magnetic transition towards T = 0 K. Our investigations, however, did not reveal the presence of superconductivity. It is likely that the field tuned transition does not correspond to a true critical point, whilst the high pressure region may be occupied by an antiferromagnetic phase, with the true critical point at higher pressures. However, other interesting features emerge in the electrical resistivity and AC-susceptibility, along with novel thermodynamic signatures linking the magnetisation to the specific heat. The doping series Lu(1-x)YxFe2Ge2 shows an antiferromagnetic transition which is suppressed to absolute zero at a critical concentration x_c=0.2. YFe2Ge2 displays anomalous low temperature behaviour consistent with the proximity to quantum critical fluctuations, along with a superconducting transition which appears in the electrical resistivity beneath a critical temperature of T_c ~ 1.7 K. Using low temperature DC magnetisation measurements, we show that this is a bulk effect, and that the superconductivity in YFe2Ge2 is of type-II. The thermodynamic and BCS properties of the superconducting phase are analysed in line with the parameters we extract experimentally. The superconducting 3-4-13 stannides (Ca,Sr)3Ir4Sn13 show a high temperature structural transition which may be suppressed by the application of hydrostatic pressure or effective chemical pressure. A superconducting dome is found, which appears to peak near where the structural transition extrapolates to zero temperature. Anomalous exponents are seen in the electrical resistivity over a wide temperature range. We investigate the influence of pressure on the superconducting critical temperature in Ca3Ir4Sn13 and the related compound Co3Ca4Sn13, along with an analysis of the upper critical field and flux-line phenomena in Ca3Ir4Sn13 and Sr3Ir4Sn13.
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El, Zoghbi Bilal. "Spin fluctuations and non-fermi liquid behavior close to a quantum critical point in CeNi2Ge2." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1255375705.

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Thesis (Ph.D.)--Kent State University, 2009.
Title from PDF t.p. (viewed Apr. 3, 2010). Advisor: Almut Schroeder. Keywords: non-Fermi liquid, CeNi2Ge2, spin fluctuations, neutron scattering, heavy fermions, quantum critical point. Includes bibliographical references.
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Radu, Maria Teodora. "Thermodynamic characterization of heavy fermion systems and low dimensional quantum magnets near a quantum critical point." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1130403549184-89465.

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We report experimentally results on the low temperature properties of two classes of materials with a special emphasizes near the QCP induced by substitution and magnetic 1.field: (1) the HF systems YbRh2(Si0.95Ge0.05)2, Yb1-yLayRh2Si2 (y = 0.05, 0.1),and YbIr2Si2 with tetragonal structures and CeIn3-xSnx (x = 0.55, 0.6, 0.65, 0.7, 0.8) with cubic structure; (2) the quantum spin systems: Cs2CuCl4 and Cs2CoCl4. In all the HF compounds we have observed NFL behavior in zero magnetic field close to the QCP. The La substituted system does not show an antiferromagnetic (AFM) transition down to the lowest accessible temperature (0.03 K) while in YbRh2(Si1-xGex)2 with x = 0 and x = 0.05 AFM transitions occur at TN =0.07 K and 0.02 K, respectively. For Yb0.9La0.1Rh2Si2 we observe below 0.07 K saturation of DeltaC/T indicating clearly a LFL state for this concentration. For YbIr2Si2, DeltaC/T saturates below 0.5 K. In contrast to the Yb based compounds in the vicinity of the QCP, CeIn3-xSnx shows no evidence of a divergence in Delta C/T, with B or with x. Furthermore, we used specic heat measurements in the mK temperature range and at high fields (up to 12 T) to probe the phase diagrams in the low dimensional quantum antiferromagnets Cs2CuCl4 and Cs2CoCl4. In applied magnetic field, we have presented experimental evidence that in Cs2CuCl4 the field dependence of the critical temperature Tc(B) ~ (Bc-B)^1-Phi close to the critical field Bc = 8.51 T is well described with Phi=1.5. This is in very good agreement with the exponent expected in the mean-field approximation and support the notion of a Bose-Einstein condensation of magnons in Cs2CuCl4.
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CAMARENA, MARIELLA ALZAMORA. "ANTIFERROMAGNETISM AND QUANTUM CRITICAL POINT IN CECOGE(2,1)SI(0,9) COMPOUND UNDER PRESSURE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11502@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CENTRO LATINO-AMERICANO DE FÍSICA
Estudos no sistema pseudoternário CeCoGe(3-x)Six (com 0 = < x = < 3) mostraram que o sistema evolui continuamente de um estado antiferromagnético da rede de Kondo (CeCoGe(3) com ~21k) para um composto de valência intermediária (CeCoSi(3) com Tw ~230k). O sistema apresenta comportamento tipo não- líquido de Fermi (NLF) em torno do ponto crítico quântico (PCQ) na concentração crítica xC = 1,25. A substituição isoeletrônica dos átomos de por não aumenta o grau de desordem magnética, sendo ideal para o estudo de efeitos intrínsecos das variações das constantes de interação da rede Kondo. Estudamos este sistema em concentrações próximas à concentração crítica através de medidas de resistividade elétrica AC sob pressão (x=0,9) e campo magnético (x =1), em amostras policristalinas. Nossos resultados mostram que a ordem magnética de longo alcance presente na amostra CeCoGe(2,1)Si(0,9) é suprimida com o aumento da pressão e, para a pressão crítica PC ( aprox. 6,2 kbar) TN é aproximadamente zero. Para temperaturas inferiores a TN, as medidas de resistividade são bem descritas considerando um espalhamento de elétrons de condução por mágnons antiferromagnéticos anisotrópicos. Acima de PC observa-se o comportamento líquido de Fermi. Na região crítica o estado NLF foi observado. A análise do comportamento da linha crítica na proximidade do PCQ indica que as flutuações magnéticas relevantes são tipicamente bidimensionais. Por outro lado, no composto CeCoGe2Si, que apresenta ordem magnética de curto alcance com TN aproximadamente 2K, observa-se que a temperatura de ordenamento é reduzida com o aumento do campo magnético e, para campos acima de 3 T, surge o comportamento tipo líquido de Fermi.
Studies on the pseudo ternary system CeCoGeSix (where 0 = < x = < ) have shown that the system evolves continuously from a Kondo lattice antiferromagnetic state ( CeCoGe(3) with ) towards a mixed valent compound ( CeCoSi(3)with Tw ~230k ). The system displays a non-Fermi-liquid-type behavior (NFL) in the vicinity of the quantum critical point (QCP) at the critical concentration . Isoelectronic substitution of atoms for does not enhance the degree of magnetic disorder, rendering it ideal for the study of the Kondo lattice¡ s interaction constants intrinsic effects. We have studied this system in polycrystalline samples at concentrations close to the critical one through AC electrical resistivity under pressure (x= 0,9) and magnetic field (x=1) measurements. Our results show that the long range magnetic order present in the CeCoGe(2,1)Si(0,9) sample is suppressed as pressure is increased, and that for the critical pressure PC (aprox. 6,2 kbar), TN (aprox. zero) . For temperatures below TN, the resisitivity data are well described considering conduction electron scattering by anisotropic antiferromagnetic magnons. Above PC we observe the Fermi liquid behavior. At the critical region, a NFL state with exponents close to 1 was found. The analysis of the behavior of the critical line in the neighborhood of the QCP indicates that the relevant magnetic fluctuations are typically two-dimensional. On the other hand, the CeCoGe(2)Si compound displays short range order (TN ~ 2k). The ordering temperature is reduced under an increase of an applied magnetic field, and for magnetic fields above 3 T a Fermi liquid behavior arises.
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Mikelsons, Karlis. "Extensions of Numerical Methods for Strongly Correlated Electron Systems." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1256909270.

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Bruin, Jan Adrianus Nathan. "Transport studies of the itinerant metamagnet Sr₃Ru₂O₇ near its quantum critical point." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3656.

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Strongly correlated metals are known to give rise to a variety of exotic states. In particular, if a system is tuned towards a quantum critical point, new ordered phases may arise. Sr₃Ru₂O₇ is a quasi-two dimensional metal in which field-tuned quantum criticality has been observed. In very pure single crystals of this material, a phase with unusual transport properties forms in the vicinity of its quantum critical point. Upon the application of a small in-plane field, electrical resistivity becomes anisotropic, a phenomenon which has led to the naming of this phase as an `electron nematic'. The subject of this thesis is a study of the electrical transport in high purity crystals of Sr₃Ru₂O₇. We modified an adiabatic demagnetisation refrigerator to create the conditions by which the entire temperature-field phase diagram can be explored. In particular, this allowed us to access the crossover between the low-temperature Fermi liquid and the quantum critical region. We also installed a triple axis `vector magnet' with which the applied magnetic field vector can be continuously rotated within the anisotropic phase. We conclude that the low- and high-field Fermi liquid properties have a complex dependence on magnetic field and temperature, but that a simple multiple band model can account for some of these effects, and reconcile the measured specific heat, dHvA quasiparticle masses and transport co-efficients. At high temperatures, we observe similarities between the apparent resistive scattering rate at critical tuning and those observed in other quantum critical systems and in elemental metals. Finally, the anisotropic phase measurements confirm previous reports and demonstrate behaviour consistent with an Ising-nematic, with the anisotropy aligned along either of the principal crystal axes. Our observations are consistent with the presence of a large number of domains within the anisotropic phase, and conclude that scattering from domain walls is likely to contribute strongly to the large measured anisotropy.
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Wang, Ruizhe. "Magnetic fluctuations and clusters in the itinerant ferromagnet Ni-V close to a disordered quantum critical point." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1555936445433091.

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Mercure, Jean-François. "The de Haas van Alphen effect near a quantum critical end point in Sr₃Ru₂O₇ /." St Andrews, 2008. http://hdl.handle.net/10023/683.

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Mercure, Jean-Francois. "The de Haas van Alphen effect near a quantum critical end point in Sr₃Ru₂O₇." Thesis, University of St Andrews, 2008. http://hdl.handle.net/10023/683.

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Highly correlated electron materials are systems in which many new states of matter can emerge. A particular situation which favours the formation of exotic phases of the electron liquid in complex materials is that where a quantum critical point (QCP) is present in the phase diagram. Neighbouring regions in parameter space reveal unusual physical properties, described as non-Fermi liquid behaviour. One of the important problems in quantum criticality is to find out how the Fermi surface (FS) of a material evolves near a QCP. The traditional method for studying the FS of materials is the de Haas van Alphen effect (dHvA). A quantum critical end point (QCEP) has been reported in the highly correlated metal Sr₃Ru₂O₇, which is tuned using a magnetic field high enough to perform the dHvA experiment. It moreover features a new emergent phase in the vicinity of the QCEP, a nematic type of electron ordering. The subject of this thesis is the study of the FS of Sr₃Ru₂O₇ using the dHvA effect. Three aspects were explored. The first was the determination of the FS at fields both above and below that where the QCEP arises. The second was the search for quantum oscillations inside the nematic phase. The third was a reinvestigation of the behaviour of the quasiparticle effective masses near the FS. In collaboration with angle resolved photoemission spectroscopy experimentalists, a complete robust model for the FS of Sr₃Ru₂O₇ at zero fields was determined. Moreover, the new measurements of the quasiparticle masses revealed that no mass enhancements exist anywhere around the QCEP, in contradiction with previous specific heat data and measurements of the A coefficient of the power law of the resistivity. Finally, we report dHvA oscillations inside the nematic phase, and the temperature dependence of their amplitude suggests strongly that the carriers consist of Landau quasiparticles.
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Onari, Seiichiro, Hiroshi Kontani, and Yukio Tanaka. "Transport phenomena in a three-dimensional system close to the magnetic quantum critical point: The conserving approximation with current vertex corrections." The American Physical Society, 2006. http://hdl.handle.net/2237/7139.

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Books on the topic "Quantum critical point"

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Iliopoulos, John. Spontaneously Broken Symmetries. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198805175.003.0005.

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In this chapter we present the solution to the problem of mass. It is based on the phenomenon of spontaneous symmetry breaking (SSB). We first give the example of buckling, a typical example of spontaneous symmetry breaking in classical physics. We extract the main features of the phenomenon, namely the instability of the symmetric state and the degeneracy of the ground state. The associated concepts of the critical point and the order parameter are deduced. A more technical exposition is given in a separate section. Then we move to a quantum physics example, that of the Heisenberg ferromagnet. We formulate Goldstone’s theorem which associates a massless particle, the Goldstone boson, to the phenomenon of spontaneous symmetry breaking. In the last section we present the mechanism of Brout–Englert–Higgs (BEH). We show that spontaneous symmetry breaking in the presence of gauge interactions makes it possible for particles to become massive. The remnant of the mechanism is the appearance of a physical particle, the BEH boson, which we identify with the particle discovered at CERN.
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Book chapters on the topic "Quantum critical point"

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Glimm, James, and Arthur Jaffe. "The φ4 Critical Point." In Quantum Physics, 339–55. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4728-9_17.

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Glimm, James, and Arthur Jaffe. "Critical point dominance in quantum field models." In Collected Papers, 326–40. Boston, MA: Birkhäuser Boston, 1985. http://dx.doi.org/10.1007/978-1-4612-5418-8_19.

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Glimm, James, and Arthur Jaffe. "Critical point dominance in quantum field models." In Collected Papers, 326–40. Boston, MA: Birkhäuser Boston, 1985. http://dx.doi.org/10.1007/978-1-4612-5421-8_15.

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Mishra, Suresh G. "Band Magnetism near a Quantum Critical Point." In Band-Ferromagnetism, 158–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44610-9_11.

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Tsvelik, Alexei M. "Wavefunction Statistics at the Quantum Hall Critical Point." In Statistical Field Theories, 329–35. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0514-2_29.

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Hlubina, R. "Magnetotransport of the Cuprates in the Quantum Critical Point Scenario." In Open Problems in Strongly Correlated Electron Systems, 417–19. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0771-9_46.

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De Grandi, C., and A. Polkovnikov. "Adiabatic Perturbation Theory: From Landau–Zener Problem to Quenching Through a Quantum Critical Point." In Quantum Quenching, Annealing and Computation, 75–114. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11470-0_4.

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José, J. V. "Quantum Zero-Point Critical Fluctuations in Arrays of Ultrasmall Josephson Junctions." In Springer Proceedings in Physics, 115–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-46851-3_9.

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Caprara, S., C. Castellani, C. Di Castro, M. Grilli, A. Perali, and M. Sulpizi. "The Stripe-Phase Quantum-Critical-Point Scenario for Hight-Tc Superconductors." In Stripes and Related Phenomena, 45–53. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47100-0_5.

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Aeppli, G., and T. F. Rosenbaum. "Quantum Critical Points-Experiments." In Dynamical Properties of Unconventional Magnetic Systems, 107–22. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4988-4_5.

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Conference papers on the topic "Quantum critical point"

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Bianconi, A. "The strain quantum critical point for superstripes." In Physics in local lattice distortions. AIP, 2001. http://dx.doi.org/10.1063/1.1363067.

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Konno, Rikio, Nobukuni Hatayama, and Yoshinori Takahashi. "Critical Crossover Behavior of Itinerant Weak Antiferromagnets around Quantum Critical Point." In Annual International Conference on Optoelectronics, Photonics & Applied Physics (OPAP 2014). GSTF, 2014. http://dx.doi.org/10.5176/2301-3516_opap14.22.

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Chand, Suman, and Asoka Biswas. "Critical-point behaviour of a measurement-based quantum heat engine." In Quantum Information and Measurement. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/qim.2019.f5a.42.

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Balicas, L., S. Nakatsuji, H. Lee, P. Schlottmann, T. P. Murphy, and Z. Fisk. "Magnetic Field-Induced Quantum Critical Point in CeAuSb2." In LOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24. AIP, 2006. http://dx.doi.org/10.1063/1.2354899.

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Iachello, F. "Critical Point Symmetries In Nuclei And Other Quantum Systems." In MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517930.

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Tomioka, Yasuhide, Naoki Shirakawa, Keisuke Shibuya, and Isao H. Inoue. "Superconductivity near a Ferroelectric Quantum Critical Point in La-doped SrTiO3." In Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019). Journal of the Physical Society of Japan, 2020. http://dx.doi.org/10.7566/jpscp.30.011036.

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COLEMAN, P. "DOES THE HEAVY ELECTRON MAINTAIN ITS INTEGRITY AT QUANTUM CRITICAL POINT?" In Physical Phenomena at High Magnetic Fields - IV. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777805_0021.

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BELITZ, D., SHARON L. SESSIONS, T. R. KIRKPATRICK, M. T. MERCALDO, R. NARAYANAN, and THOMAS VOJTA. "TRANSPORT ANOMALIES AND MARGINAL FERMI-LIQUID EFFECTS AT A QUANTUM CRITICAL POINT." In Proceedings of the 11th International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777843_0012.

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CLARK, J. W., V. A. KHODEL, and M. V. ZVEREV. "DISSECTING AND TESTING COLLECTIVE AND TOPOLOGICAL SCENARIOS FOR THE QUANTUM CRITICAL POINT." In Proceedings of the 33rd International Workshop. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814340793_0002.

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KAWAGUCHI, AKIRA, and KAORU SHIMIZU. "ENTANGLED STATE ANALYSIS FOR ONE-DIMENSIONAL QUANTUM SPIN SYSTEM: SINGULARITY AT CRITICAL POINT." In Proceedings of the International Symposium on Mesoscopic Superconductivity and Spintronics — In the Light of Quantum Computation. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701619_0003.

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Reports on the topic "Quantum critical point"

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Lai, You. Tuning the ferromagnetic tri-critical point and quantum critical point in Ce(Pd1-xNix)2P2 under high magnetic fields. Office of Scientific and Technical Information (OSTI), July 2018. http://dx.doi.org/10.2172/1463524.

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