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Unusual Change in Columnar Defect Morphology in YBCO uponAnnealing

Published online by Cambridge University Press:  17 March 2011

Y. Yan ,
M. A. Kirk ,
A. Petrean  and
L. Paulius
Y. Yan
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
M. A. Kirk
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
A. Petrean
Affiliation:
Department of Physics, Western Michigan University, Kalamazoo, MI 49008
L. Paulius
Affiliation:
Department of Physics, Western Michigan University, Kalamazoo, MI 49008
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Abstract

We show evidence from transmission electron microscopy of an unusual changein columnar defect morphology in YBCO upon annealing to 600°C. Thedisappearance of the nanotwinned, but not the larger scaled thermal twinned,structure is found. A removal of the large fluctuations in the diameter ofthe amorphous column, preserving a narrow continuous column, is surprisinglydiscovered. Correlations with magnetization measurements demonstrate thegreater efficiency of vortex pinning at 77 K by the annealed defectstructure.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 647: Symposium O – Ion Beam Synthesis & Processing of Advanced Materials , 2000 , O14.9/R9.9
Copyright
Copyright © Materials Research Society 2001

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