Journal
PHYSICAL REVIEW B
Volume 94, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.121115
Keywords
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Funding
- NSF of China [11274006, 11274084]
- National Basic Research Program [2014CB648400]
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We report the discovery of a topological semimetal, TaSb2, which crystallizes in a base-centered monoclinic, centrosymmetric structure. The compound undergoes a metal-insulator-like transition under magnetic field and exhibits a clear resistivity plateau below T-c = 13 K. The ultrahigh carrier mobility and extreme large magnetoresistance for longitudinal resistivity are observed at low temperatures in addition to a quantum oscillation behavior with nontrivial Berry phases. Moreover, the negative magnetoresistance is observed when the applied field is parallel to the current direction up to 9 T. The Hall resistivity shows the nearly linear field dependence suggestive of electron-hole noncompensation behavior. These findings uncover a materials basis represented by TaSb2 as a platform of topological materials for future theoretical and experimental investigations.
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