Indication of superconductivity at 35 K in graphite-sulfur composites.
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.
da Silva
R R
RR
Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, São Paulo, Brasil.
Torres
J H
JH
Kopelevich
Y
Y