Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite

Masatsugu Suzuki, Itsuko S. Suzuki, Robert Lee, and Jürgen Walter
Phys. Rev. B 66, 014533 – Published 19 July 2002
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Abstract

Bismuth metal graphite (MG) has a unique layered structure where Bi nanoparticles are encapsulated between adjacent sheets of nanographites. The superconductivity below Tc (=2.48K) is due to Bi nanoparticles. The Curie-like susceptibility below 30 K is due to conduction electrons localized near zigzag edges of nanographites. A magnetic-field-induced transition from metallic to semiconductorlike phase is observed in the in-plane resistivity ρa around Hc (25kOe) for both Hc and Hc (c: c axis). A negative magnetoresistance in ρa for Hc (0<H<~3.5kOe) and a logarithmic divergence in ρa with decreasing temperature for Hc (H>40kOe) suggest the occurrence of a two-dimensional weak-localization effect.

  • Received 10 December 2001

DOI:https://doi.org/10.1103/PhysRevB.66.014533

©2002 American Physical Society

Authors & Affiliations

Masatsugu Suzuki*, Itsuko S. Suzuki, and Robert Lee

  • Department of Physics, State University of New York at Binghamton, Binghamton, New York 13902-6016

Jürgen Walter

  • Department of Materials Science and Processing, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita 565-0879, Japan

  • *Electronic address: suzuki@binghamton.edu
  • Electronic address: Juerg_Walter@t-online.de

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Vol. 66, Iss. 1 — 1 July 2002

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