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Type: Artigo de periódico
Title: Magnetization measurement of a possible high-temperature superconducting state in amorphous carbon doped with sulfur
Author: Felner, I
Kopelevich, Y
Abstract: Magnetization M (T,H) measurements performed on thoroughly characterized commercial amorphous carbon powder doped with sulfur (AC-S), revealed the occurrence of an inhomogeneous superconductivity (SC) below T(c) = 38 K. The constructed magnetic field-temperature (H-T) phase diagram resembles that of type-II superconductors. However, AC-S demonstrates a number of anomalies, such as: (1) a nonmonotonic behavior of the lower critical-field H(c1) (T); (2) a pronounced positive curvature of the apparent upper critical-field boundary H(c2) (T); and (3) a spontaneous ferromagneticlike magnetization M(0) coexisting with SC. Based on the analysis of experimental results we propose a nonstandard SC state in AC-S.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.79.233409
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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