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arXiv · 1712.03362

Extremely large magnetoresistance and high-density Dirac-like fermions in ZrB2

Qi Wang·Peng-Jie Guo·Shanshan Sun·Chenghe Li·Kai Liu·Zhong-Yi Lu·Hechang Lei
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Abstract

We report the detailed study on transport properties of ZrB2 single crystal, a predicted topological nodal-line semimetal. ZrB2 exhibits extremely large magnetoresistance as well as field-induced resistivity upturn and plateau. These behaviors can be well understood by the two-band model with the perfect electron - hole compensation and high carrier mobilities. More importantly, the electrons with small effective masses and nontrivial Berry phase have significantly high density when compared to those in known topological semimetals. It strongly suggests that ZrB2 hosts Dirac-like nodal-line fermions.

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Qi Wang, Peng-Jie Guo, Shanshan Sun, Chenghe Li, Kai Liu, Zhong-Yi Lu, Hechang Lei. 2017-12-09. Extremely large magnetoresistance and high-density Dirac-like fermions in ZrB2. https://doi.org/10.1103/physrevb.97.205105

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