Magnetic-field-induced superconductor–metal-insulator transitions in bismuth metal graphite
Masatsugu Suzuki, Itsuko S. Suzuki, Robert Lee, Jürgen Walter
DOI 10.1103/PhysRevB.66.014533 · Physical Review B
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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 (=2.48 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 semiconductorlike phase is observed in the in-plane resistivity ρa around Hc (≈25 kOe) for both H⊥c and H‖c (c: c axis). A negative magnetoresistance in ρa for H⊥c (0<H<~3.5 kOe) and a logarithmic divergence in ρa with decreasing temperature for H‖c (H>40 kOe) suggest the occurrence of a two-dimensional weak-localization effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.48 | Pressure not reported | onset |
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