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Theory of Electron Density of States of High Temperature Impurity Induced Anharmonic Superconductors

Journal: Advances in Materials Physics and Chemistry
ISSN 2162-531X

Volume: 02;
Issue: 04;
Start page: 249;
Date: 2012;
Original page

Keywords: Dyson’s Equation | Lehman Representation | Anharmonicity

The expression for the electron density of states (EDOS) of high temperature superconductors (HTS) has been derived taking the disorder and anharmonicity effects as a central problem. This has been dealt with the help of double time thermodynamic Green’s function theory for electrons via a generalized Hamiltonian which consists of the contribution due to 1) unperturbed electrons; 2) unperturbed phonons; 3) isotopic impurities; 4) anharmonicities (no BCS type Hamiltonian has been taken up in the formulation); and 5) electron-phonon interactions. The renormalization effects and emergence of pairons appears as a unique feature of the theory and dependence of EDOS on impurity concentration and temperature has been discussed in details with special reference to the HTS.

Tango Jona
Tangokurs Rapperswil-Jona

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