Impurity Effects on the Superconducting Transition Temperature of NazCoO2.yH2O
arXiv:cond-mat/0312242 · doi:10.1143/JPSJ.73.1297
Abstract
Superconducting transition temperature Tc of NazCo1-xMxO2.yH2O has been studied for M=Ir and Ga, which can substitute for Co. It has been found that Tc is suppressed by the M-atom doping. The decreasing rates |dTc/dx| are of the order of 1 K/% and too small to be explained by the pair breaking mechanism for the anisotropic order parameters by non-magnetic impurities. Brief arguments are given on possible origins of the Tc suppression.
10 pages, 14 figures,submitted to J. Phys. Soc. Jpn