Superconductivity in heavy fermion systems

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)868-873
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15
Externally publishedYes

Keywords

  • Anisotropic superconductivity
  • CeIrSi
  • CeRhIn
  • Fermi surface
  • de Haas-van Alphen effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Onuki, Y., Settai, R., Honda, F., Takeuchi, T., Tateiwa, N., Matsuda, T. D., Yamamoto, E., Haga, Y., & Harima, H. (2009). Superconductivity in heavy fermion systems. Physica C: Superconductivity and its applications, 469(15-20), 868-873. https://doi.org/10.1016/j.physc.2009.05.088