Open AccessAnomalous transport properties of the antiferromagnetic Weyl semimetals Mn3 X (X = Sn, Ge)
Author(s) -
Takahiro Tomita,
Susumu Minami,
Muhammad Ikhlas,
Hiromitsu Nakamura,
Ryotaro Arita,
Satoru Nakatsuji
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2164/1/012065
Subject(s) - nernst effect , berry connection and curvature , nernst equation , condensed matter physics , antiferromagnetism , hall effect , thermomagnetic convection , thermoelectric effect , seebeck coefficient , magnetization , physics , materials science , magnetic field , quantum mechanics , geometric phase , electrode
Noncollinear antiferromagnets Mn 3 X ( X = Sn, Ge) are characterized by a large anomalous Hall effect originating from a large Berry curvature despite a vanishingly small magnetization. From recent first-principle theories, the large Berry curvature is predicted to be induced by a existence of Weyl nodes broken time-reversal symmetry. The large anomalous Nernst effect is also contributed by the magnetic Weyl state around the Fermi level E F , and likely shares its origin with the anomalous Hall effect. The thermoelectric transport S(T) and thermomagnetic transport S ji (T) are thus investigated in single crystals of Mn 3 X . Here, Mn 3 X exhibits a large anomalous Nernst effect; in particular, the signal magnitude of Mn 3 Ge exceeds 1μV/K, which is 1.5 times that of Mn 3 Sn. The Weyl properties are discussed by analyzing the thermal conductivity, specific heat, and Seebeck and Nernst effects. We also evaluate the zero-field Nernst-driven thermoelectric figure of merit for device applications in the antiferromagnets Mn 3 X .