Abstract
Bismuth metal graphite (MG) has a unique layered structure where Bi nanoparticles are encapsulated between adjacent sheets of nanographites. The superconductivity below 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 around for both and c axis). A negative magnetoresistance in for and a logarithmic divergence in with decreasing temperature for 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