Thermodynamic signature of Dirac electrons across a possible topological transition in ZrTe5
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Thermodynamic signature of Dirac electrons across a possible topological transition in ZrTe5

  • Author(s): Nair, NL
  • Dumitrescu, PT
  • Channa, S
  • Griffin, SM
  • Neaton, JB
  • Potter, AC
  • Analytis, JG
  • et al.
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.

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