THEORY OF THE ISOTOPE EFFECT AND SUPERCONDUCTING TRANSITION TEMPERATURE IN HIGH-Tc OXIDES

被引：1
|
作者：
Bechlaghem, A. [1 ]
Bourbie, D. [1 ]
机构：
[1] Univ Oran, LSMC, Es Senia 31100, Algeria
来源：
MODERN PHYSICS LETTERS B | 2011年 / 25卷 / 26期
关键词：
Superconductivity; isotope coefficient; van Hove singularity; transition temperature; electron-phonon interaction; magnetic excitations; Debye energy; VAN-HOVE SINGULARITY; VANHOVE SINGULARITY; PENETRATION DEPTH; GAP RATIO; MODEL; LA2-XSRXCUO4; COEFFICIENT; SCENARIO; LA2CUO4; LATTICE;
D O I：
10.1142/S0217984911027248
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Analytical expressions for the superconducting transition temperature T-c and the isotope coefficient alpha have been obtained for the case where the Fermi level is close to the van Hove singularity. In this approach, we consider two interactions, the first related to the phonons and the second relevant to the magnetic excitations. Our result shows that the isotope coefficient alpha decreases with the superconducting transition temperature T-c in qualitative agreement with experimental data.
引用
收藏
页码：2069 / 2078
页数：10
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