TY - JOUR
T1 - Chiral crystal structure and split Fermi surface properties in TaSi 2
AU - Nakamura, Ai
AU - Harima, Hisatomo
AU - Hedo, Masato
AU - Nakama, Takao
AU - Onuki, Yoshichika
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/11
Y1 - 2013/11
N2 - 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.
AB - 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.
KW - Chirality
KW - DHvA
KW - Fermi surface
KW - Magnetic breakthrough effect
KW - TaSi
KW - VSi
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U2 - 10.7566/JPSJ.82.113705
DO - 10.7566/JPSJ.82.113705
M3 - Article
AN - SCOPUS:84887054391
VL - 82
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
M1 - 113705
ER -