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Journal of Materials
Volume 2013 (2013), Article ID 605929, 4 pages
http://dx.doi.org/10.1155/2013/605929
Research Article

Electrons and Phonons in High Temperature Superconductors

1Department of Physics, Indian Institute of Technology, Roorkee 247667, Uttarakhand, India
2Department of Physics, Texas A&M University, Education City, Doha 23874, Qatar

Received 22 November 2012; Accepted 31 December 2012

Academic Editor: Zhiqiang Mao

Copyright © 2013 Anu Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The defect-induced anharmonic phonon-electron problem in high-temperature superconductors has been investigated with the help of double time thermodynamic electron and phonon Green’s function theory using a comprehensive Hamiltonian which includes the contribution due to unperturbed electrons and phonons, anharmonic phonons, impurities, and interactions of electrons and phonons. This formulation enables one to resolve the problem of electronic heat transport and equilibrium phenomenon in high-temperature superconductors in an amicable way. The problem of electronic heat capacity and electron-phonon problem has been taken up with special reference to the anharmonicity, defect concentration electron-phonon coupling, and temperature dependence.