Ultrafast mid-infrared response of YBa2Cu3O(7-δ)

R. A. Kaindl, M. Woerner, T. Elsaesser, D. C. Smith, J. F. Ryan, G. A. Farnan, M. P. McCurry, D. G. Walmstey

Research output: Contribution to journalArticlepeer-review

173 Scopus citations


Optical spectra of high-transition-temperature superconductors in the midinfrared display a gap of in-plane conductivity whose role for superconductivity remains unresolved. Femtosecond measurements of the mid- infrared reflectivity of YBa2Cu3O(7-δ) after nonequilibrium optical excitation are used to demonstrate the ultrafast fill-in of this gap and reveal two gap constituents: a picosecond recovery of the superconducting condensate in underdoped and optimally doped material and, in underdoped YBa2Cu3O(7-δ), an additional subpicosecond component related to pseudogap correlations. The temperature-dependent amplitudes of both contributions correlate with the antiferromagnetic 41-millielectronvolt peak in neutron scattering, supporting the coupling between charges and spin excitations.

Original languageEnglish (US)
Pages (from-to)470-473
Number of pages4
Issue number5452
StatePublished - Jan 21 2000
Externally publishedYes

ASJC Scopus subject areas

  • General


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