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Characteristics of the electrical response of YBCO films with different morphologies to optical irradiation

1991; IEEE Magnetics Society; Volume: 27; Issue: 2 Linguagem: Inglês

10.1109/20.133797

1941-0069

E.K. Track, L. Madhavrao, R. Patt, R.E. Drake, M. Radparvar,

Superconductivity in MgB2 and Alloys

YBCO films of varying thicknesses (200-3000 AA) and morphologies, have been fabricated, and their electrical response to optical radiation has been measured. A report on these measurements, emphasizing the dependence on temperature, light chopping frequency, and cryogenic environment is presented. The temperature dependence of the film resistance is determined in part by the film morphology. This morphology may be represented by a simple model consisting of a two-dimensional array of coupled grains. The magnitude of the bolometric response correlates with the sharpness of the superconducting transition. These measurements and observations lead to a proposed optimization scheme to maximize the low-temperature response and fully explore the potential for fast nonequilibrium detectors.