Pressure-Temperature Phase Diagram and Superconductivity in UIr(<SPECIAL TOPICS>Frontiers of Novel Superconductivity in Heavy Fermion Compounds)

概要

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Pressure-induced superconductivity is found in UIr without inversion symmetry. The pressure-temperature phase diagram has been investigated by means of the electrical resistivity, ac-susceptibility and magnetization measurements under high pressure. The phase diagram consists of three magnetic phases FM1-3 and a superconducting phase. The huge enhancement of residual resistivity and the negative magnetoresistance are found in the intermediate pressure region. These behavior may be induced by the pressure-induced structural phase transition and the accompanied phase separation in this pressure range. The superconducting phase with narrow pressure range is embedded in the FM3 phase, adjacent to zero-temperature FM3-to-nonmagnetic transition. The temperature dependence of resistivity above T_<sc> follows non-Fermi liquid form of T^<1.6>. From these experimental facts, superconductivity is considered to be associated with the ferromagnetic fluctuation.
社団法人日本物理学会の論文
2007-05-15