Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-01-03
Physics
Condensed Matter
Strongly Correlated Electrons
23 pages including 14 figures
Scientific paper
10.1103/PhysRevB.73.165128
Applied magnetic field induces metal - insulator and re-entrant insulator-metal transitions in both graphite and rhombohedral bismuth. 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 ~ (B - B_c)^k, where B_c 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 the signatures of quantum phase transitions associated with the M-I and I-M transformations.
da Silva Romulo Rodrigues
Kopelevich Yakov
Medina Pantoja J. C.
Moehlecke S.
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