Superconducting properties of grain-aligned HgBa2CuO4+x
J. A. Lewis, C. E. Platt, M. Wegmann, M. Teepe, J. L. Wagner, D. G. Hinks
DOI 10.1103/PhysRevB.48.7739 · Physical Review B
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Abstract
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 (H∥c axis) to ΔM (H⊥c 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | unknown |
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