Effects of La substitution on superconducting state of CeCoIn5
C. Petrovic, S. L. Bud'ko, V. G. Kogan, P. C. Canfield
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 Ce1-xLaxCoIn5 (x=0-0.15). The electronic system is in the clean limit for all values of x.
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