Superconductivity in heavy fermion systems

Y. Onuki, R. Settai, F. Honda, T. Takeuchi, N. Tateiwa, T. D. Matsuda, E. Yamamoto, Y. Haga, H. Harima

研究成果: ジャーナルへの寄稿学術誌査読


The heavy fermion state in the f-electron systems is due to competition between the RKKY interaction and the Kondo effect. The typical compound is CeCu6. To understand the electronic state, we studied the Fermi surface properties via the de Haas-van Alphen (dHvA) experiment and energy band calculation for CeSn3, CeRu2 Si2, UPt3, and nowadays, transuranium compounds. Pressure is also an important technique to control the electronic state. The Néel temperature TN decreases with increasing pressure P and becomes zero at the critical pressure Pc : TN → 0 for P → Pc. The typical compound is an antiferromagnet CeRhIn5, which we studied from the dHvA experiment under pressure. A change of the 4f-electronic state from localized to itinerant is realized at Pc ≃ 2.4 GPa, revealing the first-order phase transition, together with a divergent tendency of the cyclotron mass at Pc. It is stressed that appearance of superconductivity in CeRhIn5 is closely related to the heavy fermion state. It is also noted that the parity-mixed novel superconducting state might be realized in a pressure-induced superconductor CeIrSi3 without inversion symmetry in the crystal structure.

ジャーナルPhysica C: Superconductivity and its applications
出版ステータス出版済み - 10月 15 2009

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学


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