Effects of La substitution on superconducting state of CeCoIn5

TL;DR

This study investigates how substituting La for Ce in CeCoIn5 affects its superconducting properties, revealing strong gap anisotropy and consistent critical field anisotropy despite decreased critical temperature and upper critical field.

Contribution

It provides new insights into the effects of La substitution on the superconducting state and anisotropy in CeCoIn5, highlighting the robustness of the critical field anisotropy.

Findings

La substitution depresses Tc and Hc2

Gap anisotropy remains strong despite La doping

Electronic system stays in the clean limit

Abstract

We report effects of La substitution on superconducting state of heavy fermion superconductor CeCoIn5, as seen in transport and magnetization measurements. As opposed to the case of conventional superconductors, pair breaking by nonmagnetic La results in depression of Tc and indicates strong gap anisotropy. Upper critical field Hc2 values decrease with increased La concentration, but the critical field anisotropy, gamma=Hc2(a)/Hc2(c), does not change in the Ce_{1-x}La_xCoIn5 (x=0-0.15). The electronic system is in the clean limit for all values of x.