Chiral crystal structure and split Fermi surface properties in TaSi 2

Ai Nakamura, Hisatomo Harima, Masato Hedo, Takao Nakama, Yoshichika Onuki

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10 Citations (Scopus)


We carried out a de Haas-van Alphen (dHvA) experiment in TaSi 2with the hexagonal chiral structure, together with an energy band calculation. The Fermi surface is found to be split into two different Fermi surfaces, reflecting the non-centrosymmetric crystal structure. The magnitude of the antisymmetric spin-orbit interaction or the splitting energy between the two Fermi surfaces is determined to be 493 K for dHvA branch α (α'), 564 K for branch β (β'), and 617K for branch γ (γ'), where these dHvA branches correspond to the main Fermi surfaces. The present splitting values are compared with 19, 39, and 110K, respectively, observed in a similar compound, VSi2. The splitting energy is found to be larger in Ta-5d conduction electrons than in V-3d conduction electrons. Furthermore, we found a magnetic breakthrough effect for branches γ (γ') and α (α'), of which the circulating orbits are separate but are nearly degenerate in three and two regions, respectively.

Original languageEnglish
Article number113705
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2013 Nov


  • Chirality
  • DHvA
  • Fermi surface
  • Magnetic breakthrough effect
  • TaSi
  • VSi


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