Surface barriers, irreversibility line, and pancake vortices in an aligned HgBa2Ca2Cu3O8+δ superconductor
Y. C. Kim, J. R. Thompson, D. K. Christen, Y. R. Sun, M. Paranthaman, E. D. Specht
DOI 10.1103/PhysRevB.52.4438 · Physical Review B
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Abstract
The irreversible magnetic properties of a magnetically aligned HgBa2Ca2Cu3O8+δ superconductor have been investigated as a function of temperature and magnetic field, for both H∥c axis and H∥ab plane. Experimental results for the magnetic hysteresis ΔM, the field of first flux penetration Hp, and the irreversibility line with H∥5f aree well described by recent theory [L. Burlachkov et al., Phys. Rev. B 50, 16 770 (1994)] for thermally activated penetration of a surface barrier by pancake vortices. Near 85 K, the system crosses over from two-dimensional to three-dimensional line vortices, from which we extract estimates for the mass anisotropy parameter ε.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 133 | Pressure not reported | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
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