HgBa2CuO4+x(Hg 1:2:0:1) particles (15 wt %) were aligned in an applied magnetic field of 70 kG at room temperature in an epoxy resin. Magnetization hysteresis loops were measured from 0 to 10 kG at 20 K for samples oriented with their c axis either parallel or perpendicular to the applied field. The degree of anisotropy, characterized by the ratio of ΔM (Hc axis) to ΔM (Hc axis), was found to be field dependent. A maximum value of 4.53 was observed at 0.5 kG; however, the anisotropy decreased dramatically with increasing field and was isotropic above 3 kG. This behavior differs significantly from grain-aligned YBa2Cu3O7-x, where the anisotropy is independent of applied field, and may indicate that flux pinning is more isotropic in Hg 1:2:0:1. The critical current density Jc was estimated by the Bean model to be approximately 7×104 A/cm2 at 8 kG, 20 K and was independent of Hg 1:2:0:1 sample orientation.
ASJC Scopus subject areas
- Condensed Matter Physics