Proton radiation effects in microwave cavities and ring resonators fabricated from YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Mon Apr 08 04:00:00 EDT 1991 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.105178· OSTI ID:5731415

Weaver, B D; Pond, J M; Chrisey, D B; Horwitz, J S; Newman, H S; Summers, G P ^[1]

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1. Naval Research Laboratory, Washington, DC 20375-5000 (US)

We report the first radiation effects study on a superconducting ring resonator made from thin-film YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Exposure to 2 MeV protons causes the superconducting transition temperature {ital T}{sub {ital c}} to decrease predictably with fluence. For temperatures below about 0.9{ital T}{sub {ital c}} , there is no significant change in the transmission coefficient, the center frequency, or the quality factor {ital Q} of the resonator, even for doses in excess of 4{times}10{sup 16} protons/cm{sup 2} ({similar to}0.04 displacements per film atom). Similarly, the low-temperature surface resistance {ital R}{sub {ital s}} of an unpatterned film does not change with irradiation. We show that this insensitivity to radiation is not predicted by standard theory, and that the dominant part of {ital R}{sub {ital s}} at low temperature is the residual resistance {ital R}{sub 0}. Thus any viable theory describing the origin of {ital R}{sub 0} must, as a criterion, explain the origin of its insensitivity to large irradiation doses. This criterion is used to evaluate theories ascribing {ital R}{sub 0} to weak links, flux pinning, impurities, and lattice imperfections.

• OSTI ID: 5731415
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 58:14; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BARYONS
CAVITY RESONATORS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
EQUIPMENT
FERMIONS
FILMS
HADRONS
HIGH-TC SUPERCONDUCTORS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
PROTONS
RADIATION EFFECTS
RESONATORS
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES