Abstract
The in-plane and -axis resistivities of natural single-crystal graphite have been measured from 4 to 450 K at zero pressure and from 77 to 450 K under pressures up to 500 MPa. Data for differ strongly from earlier results obtained on synthetic graphite in showing a strong dependence of the pressure coefficient, while data for agree well with those from previous studies. Our results can be analyzed quantitatively in a simple free-electron model, and we conclude that in contrast to quasi-two-dimensional synthetic graphite, natural single-crystal graphite is an anisotropic three-dimensional semimetal.
- Received 25 August 1997
DOI:https://doi.org/10.1103/PhysRevB.57.6227
©1998 American Physical Society