Double Superconducting Transition of CePt_3Si Probed by Susceptibility Measurements(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We have investigated ac and dc magnetic susceptibilities (χ_<ac> and χ_<dc>) of the heavy-fermion superconductor CePt_3Si (T^+_c〜0.75K) for two single crystals that show a specific heat anomaly at T^-_c〜0.4K. One crystal shows a double transition at T^+_c and T^-_c in the form of structures in the out-of-phase component of χ_<ac> and in χ_<dc> measured in the cooling process. The magnetic field dependence of χ_<ac> suggests that the lower transition also originates in superconductivity. In contrast, only the higher transition has been detected in susceptibility measurements of the other crystal whose specific heat has a less dominant peak near T^-_c and a broad peak at T^+_c. These results suggest that CePt_3Si consists of two superconducting phases with different T_c's, whose volume fraction varies from sample to sample.
社団法人日本物理学会の論文
2006-08-15