Superfluid density in cuprate high-Tc superconductors: A new paradigm
J. L. Tallon, J. W. Loram, J. R. Cooper, C. Panagopoulos, C. Bernhard
DOI 10.1103/PhysRevB.68.180501 · Physical Review B
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Abstract
We show that the Uemura relation, namely Tc proportional to superfluid density ρs, is not generally satisfied in high-Tc superconductors. Instead, a modified plot of Tc/Δ0 versus ρs where Δ0 is the maximum d-wave gap at T=0, exhibits universal features that point to an alternative interpretation of the underlying physics. In the underdoped region this plot exhibits the canonical negative curvature expected when a ground-state correlation competes with superconductivity (SC) by opening up a gap (the pseudogap) in the normal-state density of states. Moreover we observe simple linear relations between Tcρs, the electronic entropy at Tc, and the critical impurity concentration for suppressing SC. These relations confirm that the pseudogap persists to T=0, strongly modifying the SC ground state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.8Ca0.2Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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