Recent Advances in the Magnetism and Superconductivity of Heavy Fermion Systems

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We present recent advances in the magnetism and superconductivity of rare earth and uranium compounds. Heavy fermions are formed on the basis of the competition between the RKKY interaction and the Kondo effect in these compounds. The application of pressure to these compounds is useful to control the electronic states in the antiferromagnets CeRh_2Si_2 and CeRhln_5, and the ferromagnet UGe_2. The quadrupole interaction or the quadrupole Kondo effect is found to be responsible for heavy fermions in PrFe_4P_<12>, A rich variety of superconducting properties are demonstrated : superconductivity of CeCoIn_5 and CeRhIn_5 in the vicinity of a quantum critical point, coexistence of ferromagnetism and superconductivity in UGe_2, and superconductivity based on the quadrupole fluctuations in PrOs_4Sb_<12>, together with the relation between the superconducting transition temperature and the quasi-two dimensionality of the electronic states.
社団法人日本物理学会の論文
2004-04-15