Superconducting fluctuations in Tl-based single crystals: Evidence of universal features and derivation of basic parameters
A. Wahl, A. Maignan, C. Martin, V. Hardy, J. Provost, Ch. Simon
DOI 10.1103/PhysRevB.51.9123 · Physical Review B
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Abstract
The critical fluctuations of the magnetization near the Hc2(T) line have been studied in four different single crystals of Tl-based compounds (Tl0.5Pb0.5Sr2CaCu2O7, Tl2Ba2Ca2Cu3O10, Tl2Ba2CaCu2O8, and TlBa2Ca2Cu3O9) with the magnetic field applied along the c axis. It is shown that the magnetization can be scaled in reduced units according to the two-dimensional scaling developed by Ullah-Dorsey and Tesanovic et al., exhibiting the universality of the fluctuations. From this analysis, we deduce the values of the Ginzburg parameter (Gi), the coherence length [ξab(0)], and the penetration depth [λab(0)] of each phase. The values of the Ginzburg fluctuation parameter in the different compounds are put in relation with the relative location of their irreversibility lines.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl0.5Pb0.5Sr2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| TlBa2Ca2Cu3O9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 114 | Pressure not reported | onset |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 101 | Pressure not reported | onset |
| Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 124 | Pressure not reported | onset |
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