Authors
Thoutam, Laxman; Pate, Samuel; Wang, Tingting; Wang, Yong-Lei; Divan, Ralu ; Martin, Ivar; Luican-Mayer, Adina; Welp, Ulrich; Kwok, Wai-Kwong; Xiao, Zhi-Li
Abstract
We report on temperature-dependent size and anisotropy of the Fermi pockets in graphite revealed by magnetotransport measurements. The magnetoresistances (MRs) obtained in fields along the c axis obey an extended Kohlers rule, with the carrier density following the 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 MR anisotropy in semimetals.