Giant Tc shift in HgBa2CaCu2O6+δ and TlBa2CaCu2O7−δ superconductors due to Hg-Tl exchange
A. A. Gapud, J. Z. Wu, B. W. Kang, S. L. Yan, Y. Y. Xie, M. P. Siegal
DOI 10.1103/PhysRevB.59.203 · Physical Review B
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Abstract
The irreversibility lines of epitaxial thin films of HgBa2CaCu2O6+δ and TlBa2CaCu2O7−δ, whether deduced from field-induced magnetoresistive broadening or onset of nonhysteretic magnetization, were found to coincide when plotted against reduced temperature, showing the same exponential-decay temperature behavior for T/Tc<0.8 and power-law behavior for T/Tc>0.8 (where Tc is zero-field, zero-resistivity critical temperature). These results indicate that replacing Tl with Hg has no noticeable effect on the anisotropy and suggests that Tc is not determined by anisotropy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | zero_resistance |
| HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 123 | Pressure not reported | zero_resistance |
| TlBa2CaCu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| TlBa2CaCu2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | zero_resistance |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | zero_resistance |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 123 | Pressure not reported | zero_resistance |
| TlBa2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | zero_resistance |
| TlBa2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | zero_resistance |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 140 | Pressure unresolved | unknown |
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