Open AccessRole of anharmonicity in the electronic heat capacity of superconductors
Author(s) -
Nitin P. Singh,
Preetam Singh Gour,
Sapan Mohan Saini
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1120/1/012033
Subject(s) - anharmonicity , hamiltonian (control theory) , condensed matter physics , superconductivity , electron , phonon , physics , quantum , heat capacity , specific heat , quantum mechanics , mathematics , mathematical optimization
The role of anharmonicity in the electronic heat capacity (EHC) of high temperature superconductors (HTS) has been investigated via electron density of state (EDOS) using quantum dynamical approach. The EDOS may be obtained using correlation function with the help of Zubarev double time temperature dependent electron Green’s functions (GF) via a generalized Hamiltonian which consists of (i) unperturbed electron, (ii) unperturbed phonon, (iii) electron-phonon, (iv) anharmonic and (v) defect interactions. The model Hamiltonian includes the force constant changes and mass difference caused by the impurities along with the effects of cubic anharmonicity reveals some striking features of EHC of HTS.