Evidence for two-component high-temperature superconductivity in the femtosecond optical response of YBa2Cu3O7-delta

Evidence for two-component high-temperature superconductivity in the femtosecond optical response of YBa2Cu3O7-delta

Femtosecond time-resolved spectrocopy has been used to investigate electronic excitations contributing to the superconducting gap function Δ(ω, T) in YBa 2Cu 3O 7-δ. The optical response is strongly peaked at 1.5 eV, and contains two distinct components: one with a characteristic relaxation time of...

Full beskrivning

Bibliografiska uppgifter
Huvudupphovsmän: Stevens, C, Smith, D, Chen, C, Ryan, J, Podobnik, B, Mihailovic, D, Wagner, G, Evetts, J
Materialtyp: Journal article
Språk:English
Publicerad: 1997
Beskrivning
Sammanfattning:Femtosecond time-resolved spectrocopy has been used to investigate electronic excitations contributing to the superconducting gap function Δ(ω, T) in YBa 2Cu 3O 7-δ. The optical response is strongly peaked at 1.5 eV, and contains two distinct components: one with a characteristic relaxation time of ∼5 ps, whose amplitude displays a two-fluid-like temperature dependence, and a long-lived component (>10 ns) which is consistent with localized quasiparticle states at the Fermi energy. The latter shows activated behavior below T c with an activation energy 2Δ 0 ≈ 3.5kT c.

Liknande verk