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Type: Artigo de periódico
Title: Evidence for internal field in graphite: a conduction electron spin-resonance study
Author: Sercheli, MS
Kopelevich, Y
da Silva, RR
Torres, JHS
Rettori, C
Abstract: We report on conduction electron spin-resonance measurements performed on highly oriented pyrolitic graphite samples between 10 and 300 K using S(v = 4 GHz), X(v = 9.4 GHz), and Q(v = 34.4 GHz) microwave bands for the external de-magnetic field applied parallel (H parallel to c) and perpendicular (H perpendicular to c) to the sample hexagonal c-axis. The results obtained in the H parallel to c geometry are interpreted in terms of the presence of an effective internal ferromagnetic-like field, He-int(eff)(T, H), that increases as the temperature decreases and the applied dc-magnetic field increases. We associate the occurrence of the H-int(eff)(T, H) with the field-induced metal-insulator transition in graphite and discuss its origin in the light of relevant theoretical models. (C) 2002 Elsevier Science Ltd. All rights reserved.
Subject: magnetically ordered materials
electron-electron interactions
phase transitions
electronic band structure
electron paramagnetic resonance
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Citation: Solid State Communications. Pergamon-elsevier Science Ltd, v. 121, n. 41921, n. 579, n. 583, 2002.
Rights: fechado
Identifier DOI: 10.1016/S0038-1098(01)00465-3
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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