Evidence for Two-Component High-Temperature Superconductivity in the Femtosecond Optical Response of YBa2Cu3O7−δ

C. J. Stevens; D. Smith; C. Chen; J. F. Ryan; B. Podobnik; D. Mihailovic; G. A. Wagner; J. E. Evetts

doi:10.1103/PhysRevLett.78.2212

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Evidence for Two-Component High-Temperature Superconductivity in the Femtosecond Optical Response of YBa2Cu3O7−δ

C. J. Stevens, D. Smith, C. Chen, J. F. Ryan, B. Podobnik, D. Mihailovic, G. A. Wagner, J. E. Evetts

DOI 10.1103/PhysRevLett.78.2212 · Physical Review Letters

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Abstract

Femtosecond time-resolved spectrocopy has been used to investigate electronic excitations contributing to the superconducting gap function Δ(ω,T) in YBa2Cu3O7−δ. The optical response is strongly peaked at 1.5 eV, and contains two distinct components: one with a characteristic relaxation time of ∼5ps, whose amplitude displays a two-fluid-like temperature dependence, and a long-lived component (>10ns) which is consistent with localized quasiparticle states at the Fermi energy. The latter shows activated behavior below Tc with an activation energy 2Δ0≈3.5kTc.

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.	87	Pressure not reported	onset