掺硫非晶碳高温超导态的磁化强度测量
Magnetization Measurement of a Possible High-Temperature Superconducting State in Amorphous Carbon Doped with Sulfur
摘要：
用磁化强度M（T，H）测量了掺硫非晶碳粉（AC-S）在T_c = 38 K以下的非均匀超导性。构造的磁场-温度（H-T）相图类似于II型超导体。然而，AC-S显示了一些异常。特别地，我们观察到（1）下临界场H_c1（T）的非单调行为;（2）与磁通晶格熔化线Hm（T）相关联的“上临界场边界”的显著正曲率;（3）与SC共存的自发类铁磁磁化M0。
英文摘要：
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. In particular, we observed (1) a non-monotonic behavior of the lower critical field H_c1(T); (2) a pronounced positive curvature of the "upper critical field boundary" that we associated with the flux lattice melting line Hm(T); (3) a spontaneous ferromagnetic-like magnetization M0 coexisting with SC. Based on the analysis of experimental results we propose a nonstandard SC state in AC-S.
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