Observation of fast nonbolometric optical response of nongranular high T/sub c/ Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ superconducting thin films

Journal Article · Mon Apr 17 04:00:00 EDT 1989 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.101390· OSTI ID:6476242

Frenkel, A; Saifi, M A; Venkatesan, T; Lin, C; Wu, X D; Inam, A

We report fast optical response measurements in predominantly c-axis oriented crystalline Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-//sub x/ superconducting thin films at the wavelength of 1.06 ..mu..m. We identify two distinct components contributing to the optical response: a nonbolometric (as fast as 1 ns) and a bolometric component (several ns). The bolometric component is stronger at temperatures in the vicinity of the transition region to the normal state. The nonbolometric component is dominant at temperatures below the transition region showing weak temperature dependence and a linear dependence on the bias current. This nonbolometric component may be evidence for nonequilibrium effects (e.g., breaking of Cooper pairs and generation of quasiparticles or other mechanisms). These results suggest that with proper optimization of device parameters (its geometry, critical current density, etc.) high-speed detectors with reasonable sensitivity covering a broad electromagnetic spectrum (visible and infrared) may be developed.

• Research Organization: Bellcore, Morristown, New Jersey 07960
• OSTI ID: 6476242
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 54:16; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
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656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
OPERATION
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PHOTODETECTORS
PHOTOSENSITIVITY
PHYSICAL PROPERTIES
POWER
SENSITIVITY
SPECTRAL RESPONSE
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
USES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES