2020Physical Review B

Negative longitudinal magnetothermopower in the topological semimetal ZrTe₅

Wenjie Zhang, Peipei Wang, Genda Gu, Xiaosong Wu, Liyuan Zhang

Physical Review B · 102, 115147 (2020)

**AI thematic illustration**Concept artwork created for this paper.

Introduction

Measurements on ZrTe₅ compare field-dependent electrical conductivity with longitudinal thermopower. Both contain a quadratic field contribution, allowing a test of their relative size as well as their sign.

A closer reading

Thermopower adds an observable sensitive to the energy dependence of transport. The quantitative relation between coefficients is more discriminating than two signs alone, though alternative mechanisms still have to be tested.