Interplay of Superconductivity, Antiferromagnetism, and Pauli Depairing in CeCoIn5

概要

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Low temperature magnetization M measurements down to 70 mK have been performed through the superconducting upper critical field H_{\text{c2}} of CeCoIn5 with the field H parallel to the c-axis of the tetragonal crystal. The crossing through the upper critical field H_{\text{c2}}(0) is marked by a sign change in the temperature dependence of M(T). A Fermi liquid law of the magnetization is observed in the superconducting phase while in the paramagnetic state above H_{\text{c2}} a quasi-linear temperature dependence is obeyed. The specific heat below H_{\text{c2}} is therefor dominated by the increase of \gamma(H), the linear term of the specific heat, and is marked by a singularity at H_{\text{c2}}(0). No indication of the so called Q-phase was observed below H_{\text{c2}} (in contrast to the case with H applied in the basal plane).
2011-05-15