High anisotropy and a dimensionality crossover in the irreversibility behavior of oxygen-deficient YBa sub 2 Cu sub 3 O sub 7 minus y

Journal Article · Fri May 01 00:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.10071· OSTI ID:7048077

Gray, K E; Kim, D H; Veal, B W ^[1]; Seidler, G T; Rosenbaum, T F ^[2]; Farrell, D E ^[3]

---

1. Materials Science Divison, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. James Franck Institute and the Department of Physics, University of Chicago, Chicago, Illinois 60637 (United States)
3. Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106 (United States)

The width in temperature of the reversible, lossy state of high-temperature superconductors (HTS's) in a magnetic field {ital H} depends on the degree of anisotropy. Compared to the parent compound YBa{sub 2}Cu{sub 3}O{sub 7}, we show here that oxygen-deficient, YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} single crystals, in which {ital T}{sub {ital c}} was varied from 10 to 55 K, are much more anisotropic and that the occurrence of the reversible, lossy state for the {bold H}{parallel}{ital c} axis is consistent with a crossover from three-dimensional (3D) vortex lines to 2D vortices, as recently proposed for the other highly anisotropic HTS's. These results, together with those from Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}}, indicate universal behavior of almost isolated Cu-O bilayer units, albeit with different doping levels, and which display magnetic reversibility controlled by the residual weak interplanar coupling.

• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 7048077
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 45:17; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
MAGNETIC PROPERTIES
COPPER OXIDES
YTTRIUM OXIDES
ANISOTROPY
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)