Magnetization measurement of a possible high-temperature superconducting state in amorphous carbon doped with sulfur

Israel Felner; Yakov Kopelevich

doi:10.1103/PhysRevB.79.233409

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Magnetization measurement of a possible high-temperature superconducting state in amorphous carbon doped with sulfur

Israel Felner, Yakov Kopelevich

DOI 10.1103/PhysRevB.79.233409 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	onset