Equilibrium superconducting properties of grain-aligned HgBa2Ca2Cu3O8+δ
Y. C. Kim, J. R. Thompson, J. G. Ossandon, D. K. Christen, M. Paranthaman
DOI 10.1103/PhysRevB.51.11767 · Physical Review B
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Abstract
The upper critical field Hc2 and other equilibrium properties of a magnetically aligned HgBa2Ca2Cu3O8+δ superconductor have been investigated. Experimental results for the reversible magnetization, both with H∥c and H∥ab, are analyzed using the theoretical formalism of Hao et al. [Phys. Rev. B 43, 2844 (1991)] for type-II superconductors. Near Tc, the slopes dHc2/dT of the upper critical field are -1.6 T/K and -12.1 T/K for fields parallel and perpendicular to the c axis, respectively. These correspond to coherence lengths (extrapolated to T=0) of ξab(0)=15 Å and ξc=1.9 Å. This gives a lower bound on the superconductive anisotropy parameter γ=(mc/mab)1/2≥8.
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. | 133.5 | Pressure not reported | onset |
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