Reversible magnetization and anisotropy in YBa{sub 2}Cu{sub 4}O{sub 8}

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.15313· OSTI ID:284711

Xu, M ^[1]; Sok, J ^[2]; Ostenson, J E; Finnemore, D K ^[3]; Dabrowski, B ^[4]

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1. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011 (United States)
2. New Material Laboratory, Material and Device Research Center, Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600 (Korea)
3. Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50511 (United States)
4. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)

The reversible magnetization for {ital H}{parallel}{ital ab} has been studied for grain-aligned YBa{sub 2}Cu{sub 4}O{sub 8} in order to determine whether the Hao-Clem theory can properly describe the vortex state in this orientation, as well as the orientation for {ital H}{parallel}{ital c}. Between temperatures of 70 and 76 K, the magnetization is reversible to better than 2{percent} and the results scale very well to the universal Hao-Clem curve even though the supercurrents have a highly noncircular path as they circulate around a vortex parallel to the {ital ab} plane. The thermodynamic critical field is the same for {ital H}{parallel}{ital ab} as for {ital H}{parallel}{ital c}, as expected, and the Ginzburg-Landau parameter {kappa}{sub {ital ab}}=380 compared to {kappa}{sub {ital c}}=70 is consistent with an anisotropy value {gamma}=5.8{plus_minus}0.4. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Ames National Laboratory
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 284711
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BARIUM OXIDES
CRITICAL FIELD
CUPRATES
HIGH-TC SUPERCONDUCTORS
MAGNETIZATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TYPE-II SUPERCONDUCTORS
YTTRIUM OXIDES