TY - JOUR
T1 - Impact of antiferromagnetic order on Landau-level splitting of quasi-two-dimensional Dirac fermions in EuMnBi2
AU - Masuda, H.
AU - Sakai, H.
AU - Tokunaga, M.
AU - Ochi, M.
AU - Takahashi, H.
AU - Akiba, K.
AU - Miyake, A.
AU - Kuroki, K.
AU - Tokura, Y.
AU - Ishiwata, S.
N1 - Funding Information:
The authors thank T. Osada, A. Tsukazaki, and Y. Fuseya for helpful discussions. This work was partly supported by PRESTO, JST (Grants No. JPMJPR16R2 and No. JPMJPR1412), Grant-in-Aid for Young Scientists A (Grant No. 16H06015), Grant-in-Aid for Scientific Research A (Grant No. 17H01195), and the Asahi Glass Foundation.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/10/9
Y1 - 2018/10/9
N2 - We report spin-split Landau levels of quasi-two-dimensional Dirac fermions in a layered antiferromagnet EuMnBi2, as revealed by interlayer resistivity measurements in a tilted magnetic field up to ∼35 T. The amplitude of Shubnikov-de Haas (SdH) oscillation in interlayer resistivity is strongly modulated by changing the tilt angle of the field, i.e., the Zeeman-to-cyclotron energy ratio. The effective g factor estimated from the tilt angle, where the SdH oscillation exhibits a phase inversion, differs by approximately 50% between two antiferromagnetic phases. This observation signifies a marked impact of the magnetic order of Eu sublattice on the Dirac-like band structure. The origin may be sought in strong exchange coupling with the local Eu moments, as verified by the first-principles calculation.
AB - We report spin-split Landau levels of quasi-two-dimensional Dirac fermions in a layered antiferromagnet EuMnBi2, as revealed by interlayer resistivity measurements in a tilted magnetic field up to ∼35 T. The amplitude of Shubnikov-de Haas (SdH) oscillation in interlayer resistivity is strongly modulated by changing the tilt angle of the field, i.e., the Zeeman-to-cyclotron energy ratio. The effective g factor estimated from the tilt angle, where the SdH oscillation exhibits a phase inversion, differs by approximately 50% between two antiferromagnetic phases. This observation signifies a marked impact of the magnetic order of Eu sublattice on the Dirac-like band structure. The origin may be sought in strong exchange coupling with the local Eu moments, as verified by the first-principles calculation.
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U2 - 10.1103/PhysRevB.98.161108
DO - 10.1103/PhysRevB.98.161108
M3 - Article
AN - SCOPUS:85054788600
SN - 2469-9950
VL - 98
JO - Physical Review B
JF - Physical Review B
IS - 16
M1 - 161108
ER -