TY - JOUR
T1 - Magnetization measurement of a possible high-temperature superconducting state in amorphous carbon doped with sulfur
AU - Felner, Israel
AU - Kopelevich, Yakov
PY - 2009/6/30
Y1 - 2009/6/30
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=68949083602&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.79.233409
DO - 10.1103/PhysRevB.79.233409
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AN - SCOPUS:68949083602
SN - 1098-0121
VL - 79
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 23
M1 - 233409
ER -