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Fermi surface properties and unconventional superconductivity in rare earth, uranium and transuranium compounds

Y. ŌNUKI1,2,* , R. SETTAI1, H. SHISHIDO3, S. IKEDA2, T. D. MATSUDA2, E. YAMAMOTO2, Y. HAGA2, D. AOKI4, H. HARIMA5, H. YAMAGAMI6

Affiliation

  1. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  2. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  3. Graduate School of Science, Kyoto University, Kyoto 606-8501, Japan
  4. Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
  5. Department of Physics, Faculty of Science, Kobe University, Kobe 657-8501, Japan
  6. Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan

Abstract

We studied the various kinds of electronic states in the f-electron systems of the cubic RX3 and AnX3 compounds and the tetragonal RTX5 and AnTX5 compounds (R: rare earth, An: Th, U, Np, Pu, T: transition metal, X: Al, Ga, In, Si, Ge, Sn) through the de Haas-van Alphen experiment and the energy band calculation. The former compounds are three dimensional in the electronic states, while the latter compounds are quasi-two dimensional. Pressure experiments were also carried out for antiferromagnets CeIn3 and CeRhIn5 to change the electronic state from the antiferromagnetically ordered state to the non-magnetic state, crossing the critical pressure region where the Néel temperature becomes zero. Around this critical pressure region, d-wave superconductivity is induced, and a marked change of the Fermi surface properties from the 4f-localized state to the 4f-itinerant state occurs at this critical pressure, revealing the first-order phase transition..

Keywords

Rare earth compounds, Actinide compounds, de Haas-van Alphen effect, Fermi surface.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

Y. ŌNUKI, R. SETTAI, H. SHISHIDO, S. IKEDA, T. D. MATSUDA, E. YAMAMOTO, Y. HAGA, D. AOKI, H. HARIMA, H. YAMAGAMI, Fermi surface properties and unconventional superconductivity in rare earth, uranium and transuranium compounds, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1535-1563 (2008)