Anisotropy of the critical current density in epitaxial YBa sub 2 Cu sub 3 O sub x films

Journal Article · Mon Jan 22 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.479· OSTI ID:7008612

Roas, B; Schultz, L ^[1]; Saemann-Ischenko, G ^[2]

---

1. Siemens AG, Forschungslaboratorien, Postfach 3220, 8520 Erlangen, West Germany (DE)
2. Physikalisches Institut, Universitaet Erlangen, Erwin Rommel Strasse 1, 8520 Erlangen, West Germany (Germany, F.R.)

The critical current density {ital j}{sub {ital c}}(B,{ital T},{theta}) of epitaxial, {ital c}-axis-oriented YBa{sub 2}Cu{sub 3}O{sub {ital x}} films was measured between 4.2 and 77 K in magnetic fields up to 8 T as a function of the field direction {theta}. Strongly enhanced critical currents are observed when the flux lines are aligned along the CuO planes, but there is also a maximum in {ital j}{sub {ital c}} when the magnetic field is adjusted parallel to the {ital c} axis. We relate these effects to an intrinsic pinning between CuO layers, an anisotropy of the shear modulus {ital c}{sub 66}, and pinning effects of twin boundaries or stacking faults perpendicular to the film plane, respectively.

• OSTI ID: 7008612
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:4; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALIGNMENT
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
EPITAXY
FILMS
LOW TEMPERATURE
MAGNETIC FLUX
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
TRANSITION ELEMENT COMPOUNDS
TWINNING
ULTRALOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES