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.
@article{arxiv.2209.08406,
title = {Temperature-driven changes in the Fermi surface of graphite},
author = {Laxman R. Thoutam and Samuel E. Pate and Tingting Wang and Yong-Lei Wang and Ralu Divan and Ivar Martin and Adina Luican-Mayer and Ulrich Welp and Wai-Kwong Kwok and Zhi-Li Xiao},
journal= {arXiv preprint arXiv:2209.08406},
year = {2022}
}