Anisotropic electrical and thermal magnetotransport in the magnetic semimetal GdPtBi
Résumé
The curvature of space-time and its consequences are often far removed from experimental accessibility. A particularly elusive effect is the generation of a heat current by the mixed axial-gravitational anomaly. However, recent theoretical investigations suggest that the magneto-thermal conductivity of condensed matter Weyl systems is linked to such an anomaly-related heat current even in flat space-time. In this paper, we report a positive magneto-thermal conductivity in the semimetal GdPtBi for collinear temperature gradients and magnetic fields (∇T∥B). The positive magneto-thermal conductivity emerges concurrently with the established anomaly-related magneto-electrical conductivity of Weyl fermions, and is locked to the parallel alignment of ∇T and B. This observation is consistent with the generation of an anomalous heat current, a fingerprint of the existence of the mixed axial-gravitational anomaly.
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