Anisotropic electrical and thermal magnetotransport in the magnetic semimetal GdPtBi

Clemens Schindler (1) , Stanislaw Galeski (1) , Walter Schnelle (1) , Rafał Wawrzyńczak (1) , Wajdi Abdel-Haq (1) , Satya Guin (1) , Johannes Kroder (1) , Nitesh Kumar (1) , Chenguang Fu (1) , Horst Borrmann (1) , Chandra Shekhar (1) , Claudia Felser (1) , Tobias Meng (2) , Adolfo G. Grushin (3) , Yang Zhang (1) , Yan Sun (1) , Johannes Gooth (1)

1 CPfS - Max Planck Institute for Chemical Physics of Solids
2 TU Dresden - Technische Universität Dresden = Dresden University of Technology
3 NEEL - TMC - Théorie de la Matière Condensée

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.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Clemens Schindler, Stanislaw Galeski, Walter Schnelle, Rafał Wawrzyńczak, Wajdi Abdel-Haq, et al.. Anisotropic electrical and thermal magnetotransport in the magnetic semimetal GdPtBi. Physical Review B, 2020, 101 (12), pp.125119. ⟨10.1103/PhysRevB.101.125119⟩. ⟨hal-03110526⟩