Title :
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
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;
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
DOI :
10.1109/QELS.1999.807394
