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
2Академия инженерных наук им. А.М. Прохорова Пресненский вал, 19, г. Москва, 123557, Россия
Received March 28, 2016
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;
Key words: high-temperature superconductors, critical temperature, spin-phonon interaction, the correlation length.
Published online: August 25, 2016