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

Abstract

Bismuth-metal graphite (MG) has a unique layered structure where Bi nanoparticles are encapsulated between adjacent sheets of nanographites. The superconductivity below $T_c$ (= 2.48 K) 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 semiconductor-like phase is observed in the in-plane resistivity ${\rho }_a$ around $H_c$ ($\approx$ 25 kOe) for both $H$$\perp$$c$ and $H$$\parallel$$c$ ($c$: c axis). A negative magnetoresistance in ${\rho }_a$ for $H$$\perp$$c$ (0$<H\le$3.5 kOe) and a logarithmic divergence in ${\rho }_a$ with decreasing temperature for $H$$\parallel$$c$ ($H$ $>$ 40 kOe) suggest the occurrence of two-dimensional weak localization effect.

9 pages, 9 figures; published in Phys. Rev. B 66, 014533 (2002)

Cited by in corpus (2)

• Small Fermi Surfaces and Strong Correlation Effects in Dirac Materials with Holography
• H-T phase diagram and the nature of Vortex-glass phase in a quasi two-dimensional superconductor: Sn metal layer sandwiched between graphene sheets