Superconducting Gap Δc, the Pseudogap Δp, and Pair Fluctuations above Tc in Overdoped Y1−xCaxBa2Cu3O7−δ from Femtosecond Time-Domain Spectroscopy
J. Demsar, B. Podobnik, V. V. Kabanov, Th. Wolf, D. Mihailovic
DOI 10.1103/PhysRevLett.82.4918 · Physical Review Letters
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Abstract
The gap structure in Y1−xCaxBa2Cu3O7−δ single crystals is investigated by real-time measurements of the quasiparticle (QP) relaxation dynamics with femtosecond optical spectroscopy. We find evidence for the coexistence of two distinct gaps. One is a T-independent pseudogap Δp and the other is a T-dependent gap Δc(T) with a BCS-like T dependence. From QP relaxation time measurements above Tc we ascertain that fluctuations associated with the latter are consistent with time-dependent Ginzburg-Landau theory and are distinct from the pseudogap whose presence is apparent well above Tc for all x.
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 | Pressure not reported | unknown |
| Y0.984Ca0.016Ba2Cu3O6.986 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.5 | Pressure not reported | unknown |
| Y0.899Ca0.101Ba2Cu3O6.943 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
| Y0.868Ca0.132Ba2Cu3O6.928 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | unknown |
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