Journal of Superconductivity

, Volume 8, Issue 1, pp 11–15 | Cite as

Nonequilibrium and bolometric responses of YBaCuO thin films to high-frequency modulated laser radiation

  • M. Zorin
  • M. Lindgren
  • M. Danerud
  • B. Karasik
  • D. Winkler
  • G. Gol'tsman
  • E. Gershenzon
Article

Abstract

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.

Key words

Nonequilibrium response bolometric effect YBa2Cu3O7−δ thin films thermal boundary resistance 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • M. Zorin
    • 1
  • M. Lindgren
    • 2
  • M. Danerud
    • 3
  • B. Karasik
    • 1
  • D. Winkler
    • 3
  • G. Gol'tsman
    • 1
  • E. Gershenzon
    • 1
  1. 1.Department of PhysicsMoscow State Pedagogical UniversityMoscowRussia
  2. 2.Department of OptoelectronicsChalmers University of TechnologyGöteborgSweden
  3. 3.Department of PhysicsChalmers University of TechnologyGöteborgSweden

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