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Updated: Dec 5, 2025
11:32
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
22.0K
Quantum oscillations with angular dependence in PdTe2single crystals
Ramakanta Chapai1, D A Browne1, David E Graf2
1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States of America.
Summary
Single crystalline palladium ditelluride (PdTe2) exhibits topological surface states and bulk Dirac points. Magnetic torque measurements reveal distinct de Haas-van Alphen oscillations, confirming its complex electronic structure and Berry phase properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Topological Materials
Background:
- Layered transition-metal dichalcogenide palladium ditelluride (PdTe2) is a material of interest.
- PdTe2 possesses both bulk Dirac points and topological surface states.
- Understanding the electronic properties of PdTe2 is crucial for exploring its potential applications.
Purpose of the Study:
- To investigate the electronic properties of single crystalline PdTe2.
- To characterize the topological surface states and bulk Dirac points.
- To determine the Berry phase and effective masses of charge carriers in PdTe2.
Main Methods:
- Magnetization and magnetic torque measurements up to 35 Tesla.
- Analysis of de Haas-van Alphen (dHvA) oscillations.
- Fitting data to the Lifshitz-Kosevich (LK) equation.
- Hall effect measurements to confirm band structure.
Main Results:
- Distinct dHvA oscillations were observed, indicating multiple electronic bands.
- Eight frequencies were identified, with two dominant low frequencies (Fα = 8 T, Fβ = 117 T).
- Effective masses (mα* = 0.059m0, mβ* = 0.067m0) and Berry phases (∼0.67π for α band, ∼0.23π-0.73π for β band) were determined.
- Angular dependence studies revealed variations in frequency and Berry phase with field direction.
Conclusions:
- The electronic band structure of PdTe2 is complex, featuring multiple bands.
- The observed Berry phases are consistent with topological properties.
- PdTe2 is a promising material for fundamental research in topological physics and potential spintronic applications.
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