Fermi Surface of a Shape Memory Alloy of TiNi

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  • Shiotani Nobuhiro
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Matsumoto Isao
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Kawata Hiroshi
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Katsuyama Jinya
    Department of Materials Science and Engineering, Osaka University
  • Mizuno Masataka
    Department of Materials Science and Engineering, Osaka University
  • Araki Hideki
    Department of Materials Science and Engineering, Osaka University
  • Shirai Yasuharu
    Department of Materials Science and Engineering, Osaka University

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Direct experimental information about the geometry of the Fermi surface of Ti48.5Ni51.5 whose martensitic transformation temperature is 170 K is presented for the first time. The present results have shown four sheets of the Fermi surface with the same topology, but with different shapes and sizes, as those predicted previously by band structure computations. From geometrical features of the Fermi surface, new possible nesting features of the electron surface at R and the hole surface at Γ are suggested for future theoretical computations of the generalized susceptibility and phonon spectra of this alloy system.

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