Nonbolometric and fast bolometric responses of YBaCuO thin films in superconducting, resistive, and normal states

Gregory N. Gol'tsman; Pavel B. Kouminov; Ivane G. Goghidze; Boris S. Karasik; Eugeni M. Gershenzon

doi:10.1117/12.176133

20 May 1994 Nonbolometric and fast bolometric responses of YBaCuO thin films in superconducting, resistive, and normal states

Gregory N. Gol'tsman, Pavel B. Kouminov, Ivane G. Goghidze, Boris S. Karasik, Eugeni M. Gershenzon

Author Affiliations +

Proceedings Volume 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric; (1994) https://doi.org/10.1117/12.176133
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The transient voltage response in both epitaxial and granular YBaCuO thin films to 20 ps pulses of YAG:Nd laser radiation with 0.63 micrometers and 1.54 micrometers was studied. In normal and resistive states both types of films demonstrate two components: nonequilibrium picosecond component and following bolometric nanosecond. The normalized amplitudes are almost the same for all films. In superconducting state we observed a kinetic inductive response and two-component shape after integration. The normalized amplitude of the response in granular films is up to several orders of magnitude larger than in epitaxial films. We interpret the nonequilibrium response in terms of a suppression of order parameter by the excess of quasiparticles followed by the change of resistance in normal and resistive states or kinetic inductance in superconducting state. The sharp rise of inductive response in granular films is explained both by a diminishing of the crossection for current percolation through the disordered network os Josephson weak links and by a decrease of condensate density in neighboring regions.

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Gregory N. Gol'tsman, Pavel B. Kouminov, Ivane G. Goghidze, Boris S. Karasik, and Eugeni M. Gershenzon "Nonbolometric and fast bolometric responses of YBaCuO thin films in superconducting, resistive, and normal states", Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994); https://doi.org/10.1117/12.176133

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