Critical current enhancement in proton-irradiated Tl sub 2 CaBa sub 2 Cu sub 2 O sub 8 films

Journal Article · Mon Jan 14 23:00:00 EST 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347384· OSTI ID:6258364

Weaver, B D; Reeves, M E; Chrisey, D B; Summers, G P ^[1]; Olson, W L; Eddy, M M; James, T W; Smith, E J ^[2]

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1. Naval Research Laboratory, Washington, DC 20375-5000 (US)
2. Superconductor Technologies, Inc., 460 Ward Drive, Santa Barbara, California 93111-2310 (US)

We have measured changes in the superconducting transition temperature {ital T}{sub {ital c}} and critical current density {ital J}{sub {ital c}} of epitaxial Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8} films upon exposure to 2 MeV protons. {ital J}{sub {ital c}} was measured inductively at 4.2 and 77 K and in fields of {ital H}=0 and 0.2 T. At 77 K and {ital H}=0, {ital J}{sub {ital c}} decreases monotonically with increasing fluence {Phi}. The rate of decrease is about 1.8 times greater than for YBa{sub 2}Cu{sub 3}O{sub 7} films, even though the rate of change of {ital T}{sub {ital c}} with {Phi} is comparable. At 4.2 K, {ital J}{sub {ital c}} is initially enhanced, even at {ital H}=0. The maximum observed increase is 34% (to 8 MA/cm{sup 2}) at {Phi}{approx}10{sup 16} protons/cm{sup 2} and {ital H}=0.2 T. This enhancement is attributed to pinning of magnetic flux lines by proton-induced defects.

• OSTI ID: 6258364
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:2; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BARYONS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CURRENTS
ELEMENTARY PARTICLES
ENERGY RANGE
EPITAXY
FERMIONS
FILMS
HADRONS
HIGH-TC SUPERCONDUCTORS
MEV RANGE
MEV RANGE 01-10
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
PROTONS
RADIATION EFFECTS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE