Lawrence Berkeley National Laboratory
Thermodynamic signature of Dirac electrons across a possible topological transition in ZrTe5
- Author(s): Nair, Nityan L
- Dumitrescu, Philipp T
- Channa, Sanyum
- Griffin, Sinead M
- Neaton, Jeffrey B
- Potter, Andrew C
- Analytis, James G
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevB.97.041111
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.