Impurity Effects on the Superconducting Transition Temperature of NazCoO2.yH2O

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.

arXiv comment10 pages, 14 figures,submitted to J. Phys. Soc. Jpn

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• Magnetic properties of superconducting cobalt oxides NaxCoO2.yH2O
• Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O I: d-vector under zero magnetic field
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• s-wave Superconductivity due to Suhl-Kondo Mechanism in Na${}_x$CoO${}_2\cdot y$H${}_2$O: Effect of Coulomb Interaction and Trigonal Distortion
• Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O II: Multiple phase diagram under the magnetic field
• Search for Magnetic Excitation Spectra of NaxCoO2.yD2O -Neutron Scattering-
• 59Co, 23Na, and 1H NMR Studies of Double-Layer Hydrated Superconductors NaxCoO2-yH2O
• Upper critical field of aligned Na_{x}(H_{3}O)_{z}CoO_{2}\cdot yH_{2}O superconductor by magnetization measurement
• Effects of Mn and Ti doping on superconductivity and charge ordering in NaxCoO2 system
• 59Co-NMR Knight Shift of Superconducting Three-Layer NaxCoO2.yH2O