Pressure dependence of the superconducting critical temperature of the Tl0.5Pb0.5Sr2Ca1−xYxCu2O7 system
D. Tristan Jover, H. Wilhelm, R. J. Wijngaarden, R. S. Liu
DOI 10.1103/PhysRevB.55.11832 · Physical Review B
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Abstract
Using a cryogenic diamond anvil cell the pressure dependence of the superconducting transition temperature Tc of Tl0.5Pb0.5Sr2Ca1−xYxCu2O7 for x=0.0,n0.1,n0.2, and 0.35 has been measured resistively up to ∼20 GPa. In high-Tc superconductors there are two contributions to the pressure dependence of Tc: one related to pressure-induced charge transfer and one due to intrinsic effects. In the present experiment these contributions could be separated using a simple phenomenological model which incorporates the effect of changes in both the yttrium content x and the applied pressure p on Tc. In this system it is found that there hardly is any charge transfer by pressure so that the intrinsic pressure effect is the main contribution to ∂Tc/∂p. The maximum Tc which can be reached in this system is 112 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl0.5Pb0.5Sr2Ca1-xYxCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure unresolved | onset |
| Tl0.5Pb0.5Sr2Ca0.8Y0.2Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure unresolved | onset |
| Tl0.5Pb0.5Sr2Ca0.65Y0.35Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure unresolved | onset |
| TlSr2CaCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
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