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Magnetization M(T,H) measurements performed on thoroughly characterizedcommercial amorphous carbon powder doped with sulfur (AC-S), revealed theoccurrence of an inhomogeneous superconductivity (SC) below T_c = 38 K. Theconstructed magnetic field-temperature (H-T) phase diagram resembles that oftype-II superconductors. However, AC-S demonstrates a number of anomalies. Inparticular, we observed (1) a non-monotonic behavior of the lower criticalfield H_c1(T); (2) a pronounced positive curvature of the "upper critical fieldboundary" that we associated with the flux lattice melting line Hm(T); (3) aspontaneous ferromagnetic-like magnetization M0 coexisting with SC. Based onthe analysis of experimental results we propose a nonstandard SC state in AC-S.

Magnetization Measurement of a Possible High-Temperature Superconducting State in Amorphous Carbon Doped with Sulfur