Ultrafast mid-infrared response of nonequilibrium excitations in the high Tc superconductor YBa2Cu3O7-δ

R. A. Kaindl, D. C. Smith, M. Woerner, C. J. Stevens, G. A. Wagner, J. E. Evetts, J. F. Ryan, T. Elsaesser

Research output: Contribution to conferencePaperpeer-review

Abstract

The ultrafast mid-infrared reflectivity changes in YBa2Cu3O7-δ after femtosecond near-infrared excitation provides new insights into the underlying quasi-particle dynamics are studied. The samples are optimally doped c-axis oriented films of 100 nm thickness sputtered onto a MgO substrate with TC = 86 K. The mid-infrared reflection sharply increases on a sub-picosecond time scale by about ΔR/R0≈10-3 and then exhibits first a fast decay within 5 ps followed by a much slower decay on the ns time scale. As the temperature increases, the signal amplitude decreases and changes its sign at the transition temperature similar to behaviour at 1.5 eV. The signal strongly depends on probe frequency and was studied over a wide spectral range (10-18 μm).

Original languageEnglish (US)
Pages120-121
Number of pages2
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 Quantum Electronics and Laser Science Conference (QELS '99) - Baltimore, MD, USA
Duration: May 23 1999May 28 1999

Conference

ConferenceProceedings of the 1999 Quantum Electronics and Laser Science Conference (QELS '99)
CityBaltimore, MD, USA
Period5/23/995/28/99

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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