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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 Tc =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 Hc1 (T); (2) a pronounced positive curvature of the apparent upper critical-field boundary Hc2 (T); and (3) a spontaneous ferromagneticlike magnetization M0 coexisting with SC. Based on the analysis of experimental results we propose a nonstandard SC state in AC-S. © 2009 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.79.233409
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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