Relationship between pressure-induced charge transfer and the superconducting transition temperature in YBa2Cu3O7−δ superconductors
Raju P. Gupta, Michèle Gupta
DOI 10.1103/PhysRevB.51.11760 · Physical Review B
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Abstract
A model is proposed for the pressure dependence of Tc based on the inverted parabolic relationship between Tc and the hole carrier density n that takes into account the fact that Tc drops to zero for a minimum value nmin or a maximum value nmax of n. The models proposed previously by Almasan et al. and Neumeier and Zimmermann are recovered, and are shown to be quite similar. Detailed calculations for YBa2Cu3O7−δ superconductors show that one can obtain large enhancements in Tc under pressure in materials that are highly underdoped, or have relatively modest rates of pressure-induced charge transfers. On the other hand, Tc enhancements in compounds which are near optimum doping or which have large rates of pressure-induced charge transfers are found to be quite modest.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.873 | Pressure unresolved | unknown |
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