Low Temperature Physics: 42, 940 (2016); https://doi.org/10.1063/1.4965897
Fizika Nizkikh Temperatur: Volume 42, Number 10 (October 2016), p. 1198-1204    ( to contents , go back )

On the possibility of increasing the critical temperature of high-temperature superconductors based on the synthesis of new classes of HTS compounds

A.M. Savchenko1 and M.A. Savchenko2

Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russian Federation
E-mail: emsavchenko@gmail.com

2Академия инженерных наук им. А.М. Прохорова Пресненский вал, 19, г. Москва, 123557, Россия
E-mail: savchenko2402@mail.ru
pos Анотація:

Received March 28, 2016

Abstract

We consider the effect of exchange enhancement of effective electron-phonon interaction in high-temperature superconducting (HTS) systems, and determine the upper limit of the applicability of quasi-linear equations. We describe the spin-phonon interaction in HTS phase. It is shown that if the resonance value of the wave vector krez << pF, the use of quasi-linear equations is justified because krez is of order of the in-verse correlation length kс, which, in turn, does not exceed the inverse coherence length (i.e., kс << pF). Thus, the quasi-linear theory of high-temperature su-perconductivity can correctly calculate the Тс for the cases when the parameter of the spin-phonon cou-pling ξ >> 1, and can determine the characteristics of the synthesis of new HTS materials with higher Тс.

PACS: 74.20.–z Theories and models of superconducting state;
PACS: 74.70.Dd Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.).

Key words: high-temperature superconductors, critical temperature, spin-phonon interaction, the correlation length.

Published online: August 25, 2016

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