Temperature-driven changes in the Fermi surface of graphite

Abstract

We report on temperature-dependent size and anisotropy of the Fermi pockets in graphite revealed by magnetotransport measurements. The magnetoresistances obtained in fields along the c-axis obey an extended Kohler's rule, with the carrier density following prediction of a temperature-dependent Fermi energy, indicating a change in the Fermi pocket size with temperature. The angle-dependent magnetoresistivities at a given temperature exhibit a scaling behavior. The scaling factor that reflects the anisotropy of the Fermi surface is also found to vary with temperature. Our results demonstrate that temperature-driven changes in Fermi surface can be ubiquitous and need to be considered in understanding the temperature-dependent carrier density and magnetoresistance anisotropy in semimetals.

arXiv commentTo appear in Physical Review B

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Cited by in corpus (2)

• Unreliability of two-band model analysis of magnetoresistivities in unveiling temperature-driven Lifshitz transition
• Unprecedented Spin-Lifetime of Itinerant Electrons in Natural Graphite Crystals