Evidence for internal field in graphite: A conduction electron spin resonance study

Details Evidence for internal field in graphite: A conduction electron spin resonance study Evidence for internal field in graphite: A conduction electron spin resonance study

2001-06-12

arxiv.org/abs/cond-mat/0106232v1

Physics

Condensed Matter

10 pages (tex), 5 figures (ps)

Scientific paper

10.1016/S0038-1098(01)00465-3

We report conduction electron spin resonance measurements performed on highly oriented pyrolitic graphite samples between 10 K and 300 K using S (f = 4 GHz), X (f = 9.4 GHz), and Q (f = 34.4 GHz) microwave bands for the external dc-magnetic field applied parallel (H || c) and perpendicular (H perp c) to the sample hexagonal c-axis. The results obtained in the H || c geometry are interpreted in terms of the presence of an effective internal ferromagnetic-like field Heff-int(T,H) that increases as the temperature decreases and the applied dc-magnetic field increases. We associate the occurrence of the Heff-int(T,H) with the field-induced metal-insulator transition in graphite and discuss its origin in the light of relevant theoretical models.

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