Field-Induced Antiferromagnetism and Upper Critical Field in Pressure-Induced Superconductor CeRhIn_5(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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An antiferromagnet CeRhIn_5 is well known to be changed into a superconductor by applying pressure P. Its electronic state IS also clarified to be changed at the critical pressure P_c≃2.5GPa under magnetic fields. We measured the low-temperature electrical resistivity of CeRhln_5 in magnetic fields up to 17T and at pressures up to 2.45GPa, and constructed phase diagrams. At P=2.45 GPa, which is close to P_c≃2.5GPa, there are four kinds of phases, namely, the paramagnetic, superconducting, superconducting and antiferromagnetic, and antiferromagnetic phases in the temperature vs magnetic field phase diagram. The antiferromagnetic phase is found to be induced in the superconducting phase under magnetic fields and expanded in magnetic fields higher than the upper critical field in superconductivity. Interestingly, the anisotropy of the upper critical field in CeRhIn_5 is found to be different from that in a similar non-magnetic heavy-fermion superconductor CeCoIn_5, revealing the anisotropic paramagnetic suppression of the upper critical field.
社団法人日本物理学会の論文
2008-08-15