Fermi Surfaces of Acceptor Intercalated Compounds: Evidence Frov Asf5-Graphite

Abstract

ABSTRACTWe find that the carrier concentration in Stage II AsF5- graphite can be varied over a wide range, f≃.30–.46. By studying the Fermi surfaces vs. f via magnetooscillations, we find that the band parameters are essentially unchanged from pure graphite. Thus suggests that all stage two compounds should display a universal behavior as a function of f, and we adduce evidence of this from the literature. We further begin an analysis of extra oscillation frequencies. In AsF5-graphite, mixing frequencies are probably caused by Fermi-level modulation (Vinter-Overhauser effect), while a low frequency (β) is associated with a superlattice.