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Indication of superconductivity at 35 K in graphite-sulfur composites
R R da Silva1, J H Torres, Y Kopelevich
1Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, São Paulo, Brasil.
Physical Review Letters
|October 3, 2001
Abstract:
We report magnetization measurements performed on graphite-sulfur composites which demonstrate a clear superconducting behavior below the critical temperature T(c0) = 35 K. The Meissner-Ochsenfeld effect, screening supercurrents, and magnetization hysteresis loops characteristic of type-II superconductors were measured. The results indicate that the superconductivity occurs in a small sample fraction, possibly related to the sample surface.