Magnetic uni- and tri-axial grain-orientation in superconductors with layered structures

We report the grain-orientation effects under a modulated rotation magnetic field for Y-based cuprate superconductors and LaFeAsO (La1111). Tri-axial orientation has been successfully achieved only for orthorhombic Y2Ba4Cu7Oy and YBa2Cu4O8 powders without a twin microstructure, while separation of t...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2010-11, Vol.470 (20), p.1056-1059
Main Authors: Horii, S., Yamaki, M., Ogino, H., Maeda, T., Shimoyama, J.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
COPPER OXIDE
CRYSTAL STRUCTURE
Cuprates superconductors (high tc and insulating parent compounds)
Exact sciences and technology
LaFeAsO
MAGNETIC FIELD
Magnetic fields
Magnetic orientation
Microstructure
MICROSTRUCTURES
Orientation
Physics
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Symmetry
Yttrium
YTTRIUM OXIDE
Y–Ba–Cu–O
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Summary:We report the grain-orientation effects under a modulated rotation magnetic field for Y-based cuprate superconductors and LaFeAsO (La1111). Tri-axial orientation has been successfully achieved only for orthorhombic Y2Ba4Cu7Oy and YBa2Cu4O8 powders without a twin microstructure, while separation of three crystallographic axes could not be observed in twinned YBa2Cu3Oy (Y123) and tetragonal La1111 powders. The morphology of grains, in addition to the symmetry of crystal structures, seriously affects the degrees of tri-axial orientation, which means that the control of twin microstructures is required for the tri-axial magnetic orientation in Y123.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2010.05.034