Thermodynamic signatures for the existence of Dirac electrons in ZrTe5

Abstract

We combine transport, magnetization, and torque magnetometry measurements to investigate the electronic structure of ZrTe5 and its evolution with temperature. At fields beyond the quantum limit, we observe a magnetization reversal from paramagnetic to diamagnetic response, which is characteristic of a Dirac semi-metal. We also observe a strong non-linearity in the magnetization that suggests the presence of additional low-lying carriers from other low-energy bands. Finally, we observe a striking sensitivity of the magnetic reversal to temperature that is not readily explained by simple band-structure models, but may be connected to a temperature dependent Lifshitz transition proposed to exist in this material.

5 pages, 4 figures

References in corpus (5)

• 3D Dirac semimetals: current materials, design principles and predictions of new materials
• Evidence for a Strong Topological Insulator Phase in $\mathrm{ZrT}{\mathrm{e}}_5$
• Quantum oscillations and Berry's phase in topological insulator surface states with broken particle-hole symmetry
• Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5
• Lifshitz transition mediated electronic transport anomaly in bulk ZrTe5

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• Turning ZrTe5 into semiconductor through atomic intercalation
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• Quasi-Dirac points in electron-energy spectra of crystals
• Nodal-line driven anomalous susceptibility in ZrSiS