Evidence for two-component superconductivity in the femtosecond optical and transient photoconducting response of YBa2Cu3O7-delta.
Femtosecond time-resolved spectroscopy and transient photoconductivity measurements have been used to investigate the time-dynamics, frequency dependence and symmetry of electronic excitations associated with the opening of the superconducting gap in YBa2Cu3O7-delta. Two clearly identifyable relaxation components are observed operative on nanosecond and picosecond timescales respectively, implying the co-existence of localized states and band-like carriers both in the superconducting and norm...Expand abstract
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