The upper critical field of superconducting polysulfur nitride, (SN)_x

A measurement of the temperature and angular dependence of the upper critical magnetic field Hc2 in crystals of polymeric (SN)x is reported. A large anisotropy is observed at all temperatures with Hc2{norm of matrix} = 8.1 ± 0.4 kOe parallel to, and Hc2⊥ = 870 ± 80 Oe perpendicular to, the polymer axis at 0°K. The results are explained in terms of the polymeric crystal structure and fibrous morphology of (SN)x. © 1976.