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Unconventional Superconductivity in f-Electron Systems
Y. Onuki,R. Settai,T. Takeuchi,Y. Haga,E. Yamamoto,N. Tateiwa,M. Nakashima,H. Shishido,T. C. Kobayashi,D. Aoki 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
We report pressure-induced superconductivity in antiferromagnetic cerium compounds and a ferromagnetic uranium compound, focusing on the relation between the superconducting state and the Fermi surface instability in CeRhIn5 and the huge upper critical eld Hc2 in CeIrSi3 without inversion symmetry in the crystal structure. The pairing interaction is well correlated with ferromagnetism, as well as antiferromagnetism or antiferromagnetic uctuations. In the recently discovered superconductor NpPd5Al2, superconductivity is found to be located in the vicinity of an antiferromagnetically ordered state. The upper critical field Hc2 is strongly supressed by the large paramagneic eect, and the corresponding magnetization curve indicates a step-like increase at Hc2, producing a first-order phase transition. We report pressure-induced superconductivity in antiferromagnetic cerium compounds and a ferromagnetic uranium compound, focusing on the relation between the superconducting state and the Fermi surface instability in CeRhIn5 and the huge upper critical eld Hc2 in CeIrSi3 without inversion symmetry in the crystal structure. The pairing interaction is well correlated with ferromagnetism, as well as antiferromagnetism or antiferromagnetic uctuations. In the recently discovered superconductor NpPd5Al2, superconductivity is found to be located in the vicinity of an antiferromagnetically ordered state. The upper critical field Hc2 is strongly supressed by the large paramagneic eect, and the corresponding magnetization curve indicates a step-like increase at Hc2, producing a first-order phase transition.