Far-infrared photoresponse of quasi-two-dimensional granular NbN/BN films

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.4059· OSTI ID:6436949

Strom, U; Culbertson, J C; Wolf, S A ^[1]; Perkowitz, S ^[2]; Carr, G L ^[3]

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1. Naval Research Laboratory, Washington, DC (USA)
2. Physics Department, Emory University, Atlanta, GA (USA)
3. Grumman Corporation Research Center, Bethpage, NY (USA)

The photoresistive response to pulsed far-infrared radiation has been measured for a thin quasi-two-dimensional film of granular NbN/BN near the resistive onset of the film. The photoresponse dependence on temperature and light intensity is observed to be a strong function of whether the energy of the far-infrared photons is less or greater than the superconducting gap energy of bulk NbN. The results are consistent with a mechanism of direct coupling to intergrain Josephson currents that dominates for below-gap light and depairing processes (vortex-antivortex or Cooper pairs) for above-gap light.

• OSTI ID: 6436949
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:7; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BORON COMPOUNDS
BORON NITRIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
GRAIN SIZE
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SIZE
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE