Title

Quantum oscillations with angular dependence in PdTesingle crystals

Document Type

Article

Publication Date

10-16-2020

Abstract

The layered transition-metal dichalcogenide PdTehas been discovered to possess bulk Dirac points as well as topological surface states. By measuring the magnetization (up to 7 T) and magnetic torque (up to 35 T) in single crystalline PdTe, we observe distinct de Haas-van Alphen (dHvA) oscillations. Eight frequencies are identified with||, with two low frequencies (= 8 T and= 117 T) dominating the spectrum. The effective masses obtained by fitting the Lifshitz-Kosevich (LK) equation to the data aremα*=0.059m0andmβ*=0.067m0whereis the free electron mass. The corresponding Landau fan diagrams allow the determination of the Berry phase for these oscillations resulting in values of ∼0.67for the 3D α band (hole-type) (down to the 1st Landau level) and ∼0.23-0.73for the 3D β band (electron-type) (down to the 3rd Landau level). By investigating the angular dependence of the dHvA oscillations, we find that the frequencies and the corresponding Berry phase (Φ) vary with the field direction, with a Φ∼ 0 whenis 10°-30° away from theplane for both α and β bands. The multiple band nature of PdTeis further confirmed from Hall effect measurements.

Publication Source (Journal or Book title)

Journal of physics. Condensed matter : an Institute of Physics journal

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