Journal
ANNALS OF PHYSICS
Volume 321, Issue 7, Pages 1575-1587Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2006.04.002
Keywords
semimetals; Landau quantization; quantum phase transitions
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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.
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