Spectral properties of rf emission from high Tc films
- Dipartimento di Fisica, Universita di Trento 38050 Povo (TN) (Italy)
Spectral properties of rf radiation from intrinsic Josephson junctions in high {Tc} Y-Ba-Cu-O thin film have been measured in the frequency range up to 1.5 GHz. Narrow emission lines with the 3 dB bandwidth of the order of 20 MHz were detected indicating that Josephson clusters radiate coherently. Synchronization conditions are determined by dc current and external magnetic field bias. Frequency locking of radiation to external resonant circuit was also observed. Spectral line narrowing due to resonant lock was distinguished from the coherence-induced narrowing by different tuning properties of the emission line. Noncoherent Josephson radiation manifests itself as a broadband background noise increase. A pronounced 1/{ital f}-like tail sensitive to dc bias and magnetic field was observed in a low frequency part of the spectrum.
- OSTI ID:
- 6483213
- Journal Information:
- Journal of Applied Physics; (USA), Vol. 68:6; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
JOSEPHSON EFFECT
COPPER OXIDES
YTTRIUM OXIDES
EMISSION SPECTRA
FILMS
GHZ RANGE 01-100
HIGH-TC SUPERCONDUCTORS
LINE NARROWING
MODE LOCKING
RADIOWAVE RADIATION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SPECTRA
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties