Relevant bibliographies by topics / Variable-range hopping model

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  1. Journal articles
  2. Dissertations / Theses
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  4. Conference papers

Academic literature on the topic 'Variable-range hopping model'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Variable-range hopping model"

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Wilkinson, M., B. Mehlig, and V. Bezuglyy. "Stick-breaking model for variable-range hopping." Philosophical Magazine Letters 88, no. 5 (May 2008): 327–34. http://dx.doi.org/10.1080/09500830801971462.

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Huda, Abdullah. "Variable Range Hopping (VRH) Model in Manganese Oxides." Defect and Diffusion Forum 303-304 (July 2010): 117–23. http://dx.doi.org/10.4028/www.scientific.net/ddf.303-304.117.

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This is a study of data analyzing by using a theoretical model for mixed-valence manganites Ln1−xAxMnO3, which exhibit a complex transport behaviour. In the high-temperature (T>TP) paramagnetic insulating regime, the resistivity of samples obeys the T-1/4 law, characteristic of variable range hopping (VRH). We address this kind of transport process as involving variable-range hopping of small polarons, and derive the resistivity expression: .
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Mehlig, Bernhard, and Michael Wilkinson. "Precise Asymptotics for a Variable-Range Hopping Model." Progress of Theoretical Physics Supplement 166 (2007): 136–42. http://dx.doi.org/10.1143/ptps.166.136.

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Hohl, H., and E. Bucher. "Pr1.9Sr1.1Cu2O6: A model 2D variable range hopping conductor." Solid State Communications 97, no. 9 (March 1996): 747–50. http://dx.doi.org/10.1016/0038-1098(95)00759-8.

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Bozhko, A. D., S. V. Demishev, V. V. Glushkov, E. A. Kataeva, N. E. Sluchanko, and A. G. Lyapin. "Spin-Dependent Variable Range Hopping Conductivity." Solid State Phenomena 152-153 (April 2009): 545–48. http://dx.doi.org/10.4028/www.scientific.net/ssp.152-153.545.

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Basing on the study of the transport in disordered carbon nanomaterials we argue that the correct description of the magnetoresistance can be obtained in a spin polarization theory, which processes separately the spin and orbital degrees of freedom in hoping conductivity in magnetic field. It is found that the polarization of the spin part of the electron wave function controls the probabilities of the hops between the single and double occupied localized states and, moreover, the spin polarization process can be treated as in the paramagnet with spin S=1/2. The experimental checking of the universal magnetoresistance scaling expected in the spin polarization model is provided.
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BHATIA, S. N., and R. WALIA. "VARIABLE RANGE HOPPING IN OXYGEN DEFICIENT YBa2Cu3Ox." International Journal of Modern Physics B 02, no. 06 (December 1988): 1381–86. http://dx.doi.org/10.1142/s0217979288001190.

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Our measurement of the resistivity and thermoelectric power from 20–300 K in the oxygen deficient YBa 2 Cu 3 O x annealed at 700, 800 and 850°C show good agreement with Mott's variable range hopping model below ~ 100 K.
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Khan, Zishan Husain, Numan Salah, and Sami Habib. "Electrical Transport Properties ofNi95Ti5Catalyzed Multi wall Carbon Nanotubes Film." Journal of Nanomaterials 2009 (2009): 1–8. http://dx.doi.org/10.1155/2009/429867.

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Carbon nanotubes (CNTs) can be understood as one or more graphite sheets rolled up into a seamless cylinder. CNTs have gained much attention and scientific interest due to their unique properties and potential applications since their discovery in 1991. In the present work, we have deposited Ni95Ti5 film using thermal deposition method. Finally, theNi95Ti5catalyzed multi wall carbon nanotubes (MWNTs) are grown on silicon substrate using low pressure chemical vapor deposition (LPCVD) method and the electrical transport properties of this MWNTs film are studied over a temperature range (284–4K) to explain the conduction mechanism. We have suggested two types of conduction mechanism for the entire temperature range. For the temperature region (284–220K), the conduction is due to thermally activated process, whereas the conduction takes place via variable range hopping (VRH) for the temperature range of (220–4K). The VRH mechanism changes from three dimensions to two dimensions as we move down to the temperature below 50K. Therefore, the data for the temperature region (220–50K) is plotted for three dimensional variable range hopping (3D VRH) model and the two dimensional variable range hopping (2D VRH) for lower temperature range of (50–4K). These VRH models give a good fit to the experimental data. Using these models, we have calculated various interesting electrical parameters such as activation energy, density of states, hopping distance and hopping energy.
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RAMESH, K. V., N. MANJULA BHARATHI, B. SRINIVASA RAO, and P. APPALA NAIDU. "AN ADIABATIC HOPPING OF dc ELECTRICAL CONDUCTIVITY STUDIES ON NiO SUBSTITUTED LEAD VANADATE GLASSES." International Journal of Modern Physics B 23, no. 23 (September 20, 2009): 4833–41. http://dx.doi.org/10.1142/s0217979209053023.

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Glasses of the system x ( NiO ) (50 – x) PbO : 50V 2 O 5 were prepared by melt quenching in the range x = 0 mol % to 15 mol%. Measurements are reported for dc electrical conductivity for the above compositions in the temperature range 300 K–500 K. The experimental results are analyzed with reference to various theoretical models proposed for dc electrical conduction in amorphous semiconductors. The analysis shows that at high temperatures the temperature dependence of dc conductivity is consistent with Mott's model of phonon-assisted hopping conduction, variable range hopping mechanism and Schnakenberg's model mechanism. The hopping in this system is adiabatic in nature.
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Grimaldi, C., P. Ryser, and S. Strässler. "Gauge factor of thick-film resistors: Outcomes of the variable-range-hopping model." Journal of Applied Physics 88, no. 7 (2000): 4164. http://dx.doi.org/10.1063/1.1290738.

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SHILAN, S. T., L. S. EWE, and R. ABD-SHUKOR. "ELECTRICAL AND MAGNETO-TRANSPORT PROPERTIES OF La0.8Sr0.2MnO3." International Journal of Modern Physics B 25, no. 28 (November 10, 2011): 3825–33. http://dx.doi.org/10.1142/s0217979211102095.

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The effects of sintering temperature on the electrical and magneto-transport properties of La 0.8 Sr 0.2 MnO 3 compounds prepared by employing a chemical co-precipitation route sintered at 1120°C, 1220°C and 1320°C are reported. The X-ray powder diffraction patterns for all samples can be indexed to the rhombohedra structure with R3C space group. The insulator–metal transition temperature remained nearly constant (~291 K) for all samples. The magneto resistance (MR) values were found to decrease noticeably as the sintering temperature was increased from 1120°C to 1320°C. Above 0.3 T, the magneto resistance was influenced by To values, which indicates the bending of Mn–O–Mn bond. The resistivity data were fitted with several equations in the metallic (ferromagnetic) region. In the insulating (paramagnetic) region, the variable range hopping and small polaron hopping models were used to compute the density of states at the Fermi level, N(EF), and activation energy (Ea) of the electrons. The resistivities can be fitted well with ρ–T2 and ρ–T2.5 curves. The variable range hopping model and small polaron hopping model fitted very well at high temperature regions, indicating that small polaron hopping might be responsible for the conduction. La 0.8 Sr 0.2 MnO 3 sintered at 1220°C demonstrated the highest MR of 6.5% in 1 T magnetic field.
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Dissertations / Theses on the topic "Variable-range hopping model"

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Bocharova, Vera. "Electrically Conductive Low Dimensional Nanostructures: Synthesis, Characterisation and Application." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1231161926227-23379.

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Miniaturization has become a driving force in different areas of technology including microelectronics, sensoric- and bio-technologies and in fundamental science. Because of the well-known limitations of conventional lithographic methods, newly emerging bottom-up approach, utilizing self-assembly of various nanoobjects including single polymer molecules and carbon nanotubes constitutes a very promising alternative for fabrication of ultimately small devices. Carbon nanotubes are attractive materials for nanotechnology and hold much promise to revolutionize fundamental science in a investigation of phenomena, associated with the nanometer–sized objects.It was found in this work that grafted chains of poly(2-vinylpyridine) form a shell covering the carbon nanotubes that makes them dispersible in organic solvents and in acidic water (CNTs-g-P2VP).The positively charged poly(2-vinylpyridine) shell is responsible for the selective deposition of carbon nanotubes onto oppositely charged surfaces. It was established that the deposition CNTs-g-P2VP from aqueous dispersions at low pH is an effective method to prepare ultra-thin films with a tunable density of carbon nanotubes.It was shown that poly(2-vinylpyridine) grafted to carbon nanotubes is a universal support for the immobilization of various nanoclusters at the carbon nanotube's surface. Prussian Blue nanoparticles were selectively attached to the surface of CNTs-g-P2VP.Conducting polymer nanowires are another very promising kind of nanomaterials that could be also suitable for applications in nanodevices and nanosensors. In this work was developed a simple method to control the conformation and orientation of single adsorbed polyelectrolyte molecules by co-deposition with octylamine. A simple chemical route to conductive polypyrrole nanowires by the grafting of polypyrrole from molecules of polystyrensulfonic acid was developed. The dc conductivity of individual polypyrrole nanowires approaches the conductivity of polypyrole in bulk.The conductivity can be described using variable-range hopping model.
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Bocharova, Vera. "Electrically Conductive Low Dimensional Nanostructures: Synthesis, Characterisation and Application." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23607.

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Abstract:
Miniaturization has become a driving force in different areas of technology including microelectronics, sensoric- and bio-technologies and in fundamental science. Because of the well-known limitations of conventional lithographic methods, newly emerging bottom-up approach, utilizing self-assembly of various nanoobjects including single polymer molecules and carbon nanotubes constitutes a very promising alternative for fabrication of ultimately small devices. Carbon nanotubes are attractive materials for nanotechnology and hold much promise to revolutionize fundamental science in a investigation of phenomena, associated with the nanometer–sized objects.It was found in this work that grafted chains of poly(2-vinylpyridine) form a shell covering the carbon nanotubes that makes them dispersible in organic solvents and in acidic water (CNTs-g-P2VP).The positively charged poly(2-vinylpyridine) shell is responsible for the selective deposition of carbon nanotubes onto oppositely charged surfaces. It was established that the deposition CNTs-g-P2VP from aqueous dispersions at low pH is an effective method to prepare ultra-thin films with a tunable density of carbon nanotubes.It was shown that poly(2-vinylpyridine) grafted to carbon nanotubes is a universal support for the immobilization of various nanoclusters at the carbon nanotube's surface. Prussian Blue nanoparticles were selectively attached to the surface of CNTs-g-P2VP.Conducting polymer nanowires are another very promising kind of nanomaterials that could be also suitable for applications in nanodevices and nanosensors. In this work was developed a simple method to control the conformation and orientation of single adsorbed polyelectrolyte molecules by co-deposition with octylamine. A simple chemical route to conductive polypyrrole nanowires by the grafting of polypyrrole from molecules of polystyrensulfonic acid was developed. The dc conductivity of individual polypyrrole nanowires approaches the conductivity of polypyrole in bulk.The conductivity can be described using variable-range hopping model.
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Book chapters on the topic "Variable-range hopping model"

1

Sen, Asok K., and Somnath Bhattacharya. "Variable Range Hopping Conduction in Complex Systems and a Percolation Model with Tunneling." In Continuum Models and Discrete Systems, 367–73. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2316-3_59.

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Abdia, R., A. Oubraham, A. Abouharim, and K. El-Hami. "Temperature-Electrical Resistivity Dependence of CdAs2 in View of Variable Range Hopping Models." In Lecture Notes in Electrical Engineering, 275–85. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36475-5_26.

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Conference papers on the topic "Variable-range hopping model"

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Aparecido-Ferreira, A., G. M. Ribeiro, E. S. Alves, J. F. Sampaio, Jisoon Ihm, and Hyeonsik Cheong. "Application of Variable Range Hopping Model to a Granular Carbon." In PHYSICS OF SEMICONDUCTORS: 30th International Conference on the Physics of Semiconductors. AIP, 2011. http://dx.doi.org/10.1063/1.3666266.

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Aparecido-Ferreira, A., G. M. Ribeiro, E. S. Alves, J. F. Sampaio, Jisoon Ihm, and Hyeonsik Cheong. "Application of Variable Range Hopping Model to a Granular Carbon." In PHYSICS OF SEMICONDUCTORS: 30th International Conference on the Physics of Semiconductors. AIP, 2011. http://dx.doi.org/10.1063/1.3666267.

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Piccinini, Enrico, Fabrizio Buscemi, Thierry Tsafack, Massimo Rudan, Rossella Brunetti, and Carlo Jacoboni. "Investigation of Charge Transport in Amorphous Ge2Sb2Te5 Using the Variable-Range Hopping Model." In 2009 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD). IEEE, 2009. http://dx.doi.org/10.1109/sispad.2009.5290207.

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