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Type: Artigo de periódico
Title: Magnetic-field-driven quantum critical behavior in graphite and bismuth
Author: Kopelevich, Y
Pantoja, JCM
da Silva, RR
Moehlecke, S
Abstract: We study magnetotransport properties of graphite and rhombohedral bismuth samples and found that in both materials applied magnetic field induces the metal-insulator- (MIT) and reentrant insulator-metal-type (IMT) transformations. The corresponding transition boundaries plotted on the magnetic field-temperature (B-T) plane nearly coincide for these semimetals and can be best described by power laws T similar to(B-B)(k), where B, is a critical field at T = 0 and K = 0.45 +/- 0.05. We show that insulator-metal-insulator (I-M-I) transformations take place in the Landau level quantization regime and illustrate how the IMT in quasi-3D graphite transforms into a cascade of I-M-I transitions, related to the quantum Hall effect in quasi-2D graphite samples. We discuss the possible coupling of superconducting and excitonic correlations with the observed phenomena, as well as signatures of quantum phase transitions associated with the M-I and I-M transformations. (c) 2006 Elsevier Inc. All rights reserved.
Subject: semimetals
Landau quantization
quantum phase transitions
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.apo.2006.04.002
Date Issue: 2006
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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