PT Journal
AU Gol'tsman, GN
   Kouminov, P
   Goghidze, I
   Gershenzon, EM
TI Nonequilibrium kinetic inductive response of YBaCuO thin films to low-power laser pulses
SO Phys. C: Supercond.
JI Phys. C: Supercond.
PY 1994
BP 1979
EP 1980
VL 235-240
DI 10.1016/0921-4534(94)92211-X
DE YBCO HTS KID
AB Transient non-equilibrium kinetic inductive voltage response of YBaCuO thin films to 20 ps pulses of YAG:Nd laser radiation with 0.63 μm and 1.5 μm wavelength has been revealed. By increasing the sensitivity of 100 ps resolution time registration system and diminishing light intensity (fluence 0.1-1 μJ2/cm2) and transport current (density j≤105 A/cm2) we observed a perculiar bipolar signal form with nearly equal amplitudes of each sign. The integration of the kinetic inductive response over time gives the result which is qualitatively of the same form as the response in the resistive and normal states: nonequilibrium picosecond scale component followed by bolometric nanosecond. Nonequilibrium response is interpreted as suppression of order parameter by excess of quasiparticles followed by a change in resistance in the resistive state and kinetic inductance in superconductive state.
ER