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Proceedings Paper

Far infrared response of thin film Bi2Sr2CaCu2O8 using the UcSb free electron laser
Author(s): W. Prettl
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Paper Abstract

There has been considerable interest in understanding the optical and infrared response of high Tc superconductors. In previous studies of thin films a wide range of response times has been observed. Slow signals, with time constants in the range of microseconds to milliseconds, were identified as a bolometric response arising from heating of the film. Fast signals, with time constants of the order of nanoseconds or less, have been attributed to variety of different non-thermal mechanisms [1, 2]. Drastic variations of the response time with frequency were found in T12Ba2Ca1Cu208 and YBa2Cu307_, [3] films using molecular FIR lasers (pumped by mode locked TEA CO2 lasers) as sources. Below about vc = 100 cm' only fast signals with a time constant of the order of 1 ns were observed whereas above vc purely a slow response of bolometric character occurred. The transition frequency vc has been identified with the energy gap at the surface of superconducting grains [3].

Paper Details

Date Published: 14 December 1992
PDF: 2 pages
Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19290B (14 December 1992); doi: 10.1117/12.2298128
Show Author Affiliations
W. Prettl, Univ. Regensburg (Germany)

Published in SPIE Proceedings Vol. 1929:
17th International Conference on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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