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Type: Artigo de periódico
Title: Negative c-axis magnetoresistance in graphite
Author: Kopelevich, Y
da Silva, RR
Pantoja, JCM
Bratkovsky, AM
Abstract: We have studied the c-axis interlayer magnetoresistance (ILMR), R(c)(B) in graphite. The measurements have been performed on strongly anisotropic highly oriented pyrolytic graphite (HOPG) and single crystalline Kish graphite samples in magnetic field up to B = 9 T, and the temperature interval 2 K <= T <= 300 K. We have observed negative magnetoresistance, dR(c)/dB < 0, for B parallel to c-axis for both samples above a certain field B(m)(T) > 5.4 T and 0.2 T for HOPG and Kish graphite, respectively. The results can be understood consistently by assuming that ILMR is related to a tunneling between zero-energy Landau levels of quasi-two-dimensional Dirac fermions, in a close analogy with the behavior reported for alpha-(BEDT-TIT)(2)I(3) [N. Tajima, et al., Phys. Rev. Lett. 102 (2009) 176403], another multilayer Dirac electron system. (C) 2010 Elsevier B.V. All rights reserved.
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physics Letters A. Elsevier Science Bv, v. 374, n. 45, n. 4629, n. 4632, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.physleta.2010.09.024
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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