Phase fluctuations, dissipation, and superfluid stiffness in d-wave superconductors
L. Benfatto, S. Caprara, C. Castellani, A. Paramekanti, M. Randeria
DOI 10.1103/PhysRevB.63.174513 · Physical Review B
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Abstract
We study the effect of dissipation on quantum- and thermal-phase fluctuations in d-wave superconductors. Dissipation, arising from a nonzero low-frequency optical conductivity that has been measured in experiments below Tc, has two effects: (1) a reduction of zero-point phase fluctuations, and (2) a reduction of the temperature at which one crosses over to classical thermal fluctuations. For parameter values relevant to the cuprates, we show that the crossover temperature is still too large for classical phase fluctuations to play a significant role at low temperature. Quasiparticles are thus crucial in determining the linear temperature dependence of the in-plane superfluid stiffness. Thermal phase fluctuations become important at higher temperatures and play a role near Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2212 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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