Specific Heat Study of Magnetic and Superconducting Transitions in CePt_3Si(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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Measurements of specific heat between 80mK to 4K and electrical resistivity between 80mK to 10K were carried out for polycrystalline CePt_3Si samples cut into small pieces (typically 〜10mg). In the specific heat measurements, we observed an antiferromagnetic transition jump at T_N=2.2K for all the samples, while the heights have large variations. As regards superconductivity, we observed two distinct transition jumps at T^1_c〜0.45K and T^h_c〜0.75K, which were the same for all the samples. From the measurements of specific heat and resistivity, systematic relations were found between antiferromagnetic and superconducting transitions. We conclude that antiferromagnetism, whose transition temperature is 2.2K, coexists with superconductivity, whose transition temperature is T^1_c. In this sample, residual electronic specific heat coefficient in the superconducting state γ_s was quite small, and specific heat divided by temperature below T^1_c, decreased almost linearly with decreasing temperature. In order to reveal the characteristic properties of the magnetism and superconductivity of the CePt_3Si system, it is important to study the two superconducting phases with T^1_c and T^h_c, respectively.
社団法人日本物理学会の論文
2008-04-15