PT Journal
AU Zorin, M
   Lindgren, M
   Danerud, M
   Karasik, B
   Winkler, D
   Gol'tsman, G
   Gershenzon, E
TI Nonequilibrium and bolometric responses of YBaCuO thin films to high-frequency modulated laser radiation
SO J. Supercond.
JI J. Supercond.
PY 1995
BP 11
EP 15
VL 8
IS 1
DI 10.1007/BF00732234
DE YBCO HTS HEB
AB Picosecond nonequilibrium and slow bolometric responses to infrared radiation from a patterned high-T c superconducting (HTS) film in resistive and normal states deposited onto LaAlO3, NdGaO3, and MgO substrates were investigated using both pulse and modulation techniques. The response time of 35 ps to a laser pulse of 17 ps FWHM has been observed. The intrinsic response time of the fast process is expected to be about a few picoseconds. The modulation technique, being free from the disadvantages of pulse methods (poor sensitivity, limited dynamic range), makes the detailed study of a number of relaxation processes possible. Besides the nonequilibrium response, two kinds of bolometric processes, namely phonon transport through the film-substrate interface and phonon thermal diffusion in a substrate, manifest themselves in certain frequency dependences.
ER