Fluctuations and critical temperature reduction in cuprate superconductors
J. L. Tallon, J. G. Storey, J. W. Loram
DOI 10.1103/PhysRevB.83.092502 · Physical Review B
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Abstract
We show theoretically that phase and amplitude fluctuations set in simultaneously in the cuprates. We then analyze fluctuations about Tc in the specific heat of (Y,Ca)Ba2Cu3O7−δ, YBa2Cu4O8, and Bi2Sr2CaCu2O8+δ. The mean-field transition temperature, Tcmf, in the absence of fluctuations lies well above Tc and at low doping reaches as high as 150 K. Tcmf is found to be unrelated to the pseudogap temperature T*, but scales with the gap Δ0, such that 2Δ0/kBTcmf is comparable to the BCS weak-coupling value 4.3, for d-wave superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.8Ca0.2Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82.27 | Pressure not reported | unknown |
| YBa2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.9 | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 81 | Pressure not reported | unknown |
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