Unconventional anomalous Hall, Nernst and thermal Hall responses in Fe<sub>3</sub>GeTe<sub>2</sub>
ORAL
Abstract
Here, we evaluate the anomalous Hall, Nernst and thermal responses of the layered ferromagnet Fe3GeTe2 as a function of the temperature and field orientation. The Hall conductivity sxyA increases and saturates to large values upon cooling, buy the anomalous Nernst SxyA is observed to change its sign below T = 50 K. This is surprising given that both quantities result from the texture of the Berry curvature near the Fermi level, with the change in the sign in SxyA suggesting a possible topological transition. In support of this assertion, the anomalous thermal Hall kxyA is seen to display an anomaly around T = 50 K, albeit its ratio with respect to sxyA indicates that the Wiedemann Franz law is satisfied by this compound. Surprisingly, one observes anomalous transport quantities also for electrical currents and thermal gradients applied along the magnetic field. Furthermore, for this field orientation the anomalous quantities do not follow the magnetization.
*This work was performed at the Tallahassee National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. L.B. is supported by the US DOE-BES through award DE-SC0002613.
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Presenters
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Luis Balicas
- National High Magnetic Field Laboratory
- National High Magnetic Field Laboratory, Florida State University
- National High Magnetic Field Lab
- Condensed Matter Science, National High Magnetic Field Laboratory