Superconducting-state thermodynamic parameters and anisotropy of HgBa2Can−1CunOy by reversible magnetization measurements
R. Puźniak, R. Usami, K. Isawa, H. Yamauchi
DOI 10.1103/PhysRevB.52.3756 · Physical Review B
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Abstract
Measurements of the reversible magnetization in magnetic fields parallel and perpendicular to the c axis have been performed on magnetically aligned nearly-single-phase crystalline HgBa2Can−1CunOy (n=1, 2, and 3) samples. The basic thermodynamic parameters describing the superconducting state, such as the penetration depth, the coherence length, the lower and upper critical fields, and their anisotropy, were determined. The anisotropy of HgBa2Can−1CunOy was found to increase as the number of the copper oxide layers in the unit-cell increases, although the magnitude of the anisotropy is rather small. Relatively smaller values of the thermodynamic critical field, in comparison with that of YBa2Cu3O7−δ, can cause the lower position of the irreversibility lines determined for the Hg-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 127 | Pressure unresolved | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 135 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 130 | Pressure not reported | unknown |
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