期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 29, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/29/1/015015
关键词
superconductivity; graphene; graphite
资金
- United States Air Force under AFOSR [FA9550-10-10134]
We have observed evidence of superconductivity at temperatures in the vicinity of 260 K in phosphorus-doped graphite and graphene. This evidence includes transport current, magnetic susceptibility, Hall effect and (pancake) vortex state measurements. All of these measurements indicate a transition which is that of a type II superconductor with no type I phase until below the limits of our measurement capabilities. Vortex states are inferred from periodically repeated steps in the resistance versus temperature characteristics of highly oriented pyrolytic graphite and exfoliated doped multilayer graphene. Magnetic susceptibility measurements have shown results qualitatively similar to those expected (and experimentally observed by others) for ultra-thin (thickness <
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