Large magnetothermopower and Fermi surface reconstruction in Sb${}_2$Te${}_2$Se

Abstract

We report the magnetoresistance, magnetothermopower and quantum oscillation study of Sb${}_2$Te${}_2$Se single crystal. The in-plane transverse magnetoresistance exhibits a crossover at a critical field $B^{\ast }$ from semiclassical weak-field $B^2$ dependence to the high-field unsaturated linear magnetoresistance which persists up to the room temperature. The low-temperature Seebeck coefficient is negative in zero field contrary to the positive Hall resistivity, indicating the multiband effect. The magnetic field induced the sign reversion of the Seebeck coefficient between 2 K and 150 K, . The quantum oscillation of crystals reveals the quasi-two-dimensional (quasi-2D) Fermi surface. These effects are possibly attributed to the large Fermi surface which touches Brillouin zone boundary to becomes quasi-2D and the variation in the chemical potential induced by the magnetic field.

arXiv comment6 pages, 6 figures

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Cited by in corpus (6)

• Colloquium: Topological Band Theory
• Quantum oscillations in metallic Sb2Te2Se topological insulator
• Anomalous Magnetothermopower in a Metallic Frustrated Antiferromagnet
• Magnetoresistive property study of direct and indirect band gap thermoelectric Bi-Sb alloys
• Spin-orbit-derived giant magnetoresistance in a layered magnetic semiconductor AgCrSe2
• Converting topological insulators into topological metals within the tetradymite family