Thermal conductivity study on the borocarbide superconductor LuNi2B2C under applied magnetic fields

Abstract

Applied magnetic field dependence of thermal conductivity (TC) and the temperature dependences of resistivity and magnetization on the nickel borocarbide superconducting compound LuNi2B2C have been measured in the temperature range from 4.2 to 30 K, under the applied magnetic field range of 0–8 T. The magnetic field dependence of the TC showed characteristic behavior at the lower and the upper critical fields at temperatures below Tc. We present the first temperature dependence curve of upper critical field derived from the results of TC measurement of LuNi2B2C.