Pressure dependence of Tc in cuprate superconductors: Application to (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy
D. Goldschmidt, A. -K. Klehe, J. S. Schilling, Y. Eckstein
DOI 10.1103/PhysRevB.53.14631 · Physical Review B
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Abstract
We have measured the pressure dependence of the superconducting transition temperature Tc within a large range of doping in (CaxLa1−x)(Ba1.75−xLa0.25+x)Cu3Oy. This charge-compensated 1:2:3 family is tetragonal, and free of the plateau structure and of structural phase transitions. The pressure (P) dependence of Tc is analyzed in terms of two easily determined variables, Tcmax (maximal attainable Tc) and the relative chemical charge Δq=y−yM−I(x) (the oxygen content y measured with respect to its value at the metal-insulator transition), used to describe the dependence of Tc on doping for all values of x and y. Assuming a simple parabolic relationship between Tc and Δq that does not broaden with P, we derive an expression for dTcdP containing contributions from both dΔqdP and dTcmaxdP which are dominant far away from and in the vicinity of optimal doping, respectively. We obtain in this family reliable values of the derivatives, dTcmaxdP=+1.7 K/GPa and dΔqdP=+0.011|e|GPa which are constant, independent of the doping level, as anticipated by our simple analysis.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ca0.4La0.6Ba1.6La0.4Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79.4 | Pressure unresolved | onset |
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