14 December 1992 Far infrared response of thin film Bi2Sr2CaCu2O8 using the UcSb free electron laser
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Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19290B (1992) https://doi.org/10.1117/12.2298128
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States
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].
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. Prettl, "Far infrared response of thin film Bi2Sr2CaCu2O8 using the UcSb free electron laser", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19290B (14 December 1992); doi: 10.1117/12.2298128; https://doi.org/10.1117/12.2298128
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