Ultrafast mid-infrared response of nonequilibrium excitations in the high T/sub c/ superconductor YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//

Author

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

Author_Institution

Max-Born-Inst., Berlin, Germany

fYear

1992

fDate

23-28 May 1992

Firstpage

120

Lastpage

121

Abstract

Summary form only given. We report on the first time-resolved study of the ultrafast mid-infrared reflectivity changes in YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) after femtosecond near-infrared excitation providing new insights into the underlying quasi-particle dynamics. Our samples are optimally doped c-axis oriented films of 100 nm thickness sputtered onto a MgO substrate with T/sub c/=86 K.

Keywords

barium compounds; high-speed optical techniques; high-temperature superconductors; reflectivity; superconducting thin films; superconducting transition temperature; yttrium compounds; 10 to 20 mum; 100 nm; 86 K; MgO; MgO substrate; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//; YBa/sub 2/Cu/sub 3/O/sub 7/; femtosecond near-infrared excitation; high T/sub c/ superconductor; nonequilibrium excitations; optimally doped c-axis oriented films; quasi-particle dynamics; sputter deposition; sputtered films; time-resolved study; ultrafast mid-infrared reflectivity changes; ultrafast mid-infrared response; Absorption; Electrons; Infrared spectra; Probes; Reflectivity; Superconducting photodetectors; Superconducting transition temperature; Temperature dependence; Temperature distribution; Yttrium barium copper oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics and Laser Science Conference, 1999. QELS '99. Technical Digest. Summaries of Papers Presented at the

Conference_Location

Baltimore, MD, USA

Print_ISBN

1-55752-576-X

Type

conf

DOI

10.1109/QELS.1999.807394

Filename

807394