Flux pinning by collective stacking faults in Y{sub 0.6}Ho{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub y} prepared by powder melting process
- Northwest Institute for Nonferrous Metal Research, Baoji Shaanxi 721014, Peoples Republic of (China)
- Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome Koto-ku, Tokyo 135 (Japan)
The correlation between microstructure and flux pinning of Y{sub 0.6}Ho{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub y} (123) sample prepared by the powder melting process method has been investigated. Transmission electron microscopy observations show that there exists a large number of novel stacking faults (double CuO chains) in this sample. The shape of the stacking faults looks like collective stairs. The stacking faults are different from those observed in the conventional melt textured 123 materials and not related to 123/Y{sub 2}BaCuO{sub 5} interface. The sample is resintered at 900{degree}C purposefully in order to reduce the density of stacking faults. The magnetization measurements indicate that the critical current density and irreversibility lines in both field orientations (H{parallel}c and H{perpendicular}c) are significantly reduced by the decrease in the density of stacking faults. This means that the collective stacking faults work as effective pinning centers in the 123 superconductors prepared by the powder melting process method in a wide range of temperatures and fields. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 503574
- Journal Information:
- Applied Physics Letters, Vol. 70, Issue 21; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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