Influence of impurity on isotope coefficient of superconductors

TL;DR

This paper investigates how anisotropic impurity potentials affect the isotope coefficient in superconductors, using numerical models that align well with experimental data on high-Tc materials.

Contribution

It introduces a harmonic form model for impurity potential anisotropy and calculates its impact on isotope coefficients in superconductors.

Findings

Numerical results match experimental data for high-Tc superconductors.

Anisotropy of impurity potential significantly influences isotope coefficient.

Harmonic form assumptions effectively model impurity effects.

Abstract

We study the influence of anisotropy of the impurity potential on isotope coefficient of an impure superconductor in Born limit. From the isotope coefficient of non-magnetic and magnetic impurities including an angle-resolved Fermi surface density of state, anisotropy order parameter and impure potential, we make the assumption that the form of them are in the harmonic form and are investigated. Our numerical calculation of isotope coefficient can fit well with experimental data of high-Tc superconductors.