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Type: Artigo de periódico
Title: Transverse magnetoresistance in FeCl3 GIC
Author: Silva, MP
Santos, C
Hengeltraub, A
Gualberto, GM
Abstract: GlC-FeCl3 samples were prepared from a host matrix of highly oriented pyrolytic graphite using the two-zone phase growth method. The stage index, n, was determined by means of the (00l) X-ray diffraction peaks from a theta-2 theta scan at room temperature. Specimens of well-staged GlC-FeCl3 with n = 1, 3, 4, 5, 6 and 11 were selected. The transverse resistivity rho(H) was determined with the magnetic field H applied perpendicularly to the c-axis, whereas the electrical current flowed in the c-axis direction. The transverse magnetoresistance, defined as [rho(H) - rho(0)]/rho(0), was obtained for the fixed values of the temperature T = 4.2 K and T = 300 K, at H = 40 kG, for the various samples with different stage indices, We further report the magnetoresistance, at T = 4.2 K, as a function of H in the range 0 less than or equal to H less than or equal to 40 kG for the different values of the stage index. No agreement could be obtained with predictions based on band models for two or more bands. This seems to indicate a thermally activated hopping conduction mechanism as a possible alternative to lead to explanations of the observed behavior of the transverse magnetoresistance.
Subject: graphite
transverse magnetoresistance
Country: Suíça
Editor: Elsevier Science Sa Lausanne
Citation: Synthetic Metals. Elsevier Science Sa Lausanne, v. 87, n. 1, n. 1, n. 4, 1997.
Rights: fechado
Identifier DOI: 10.1016/S0379-6779(97)80089-6
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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