Flux pinning by 211 precipitates in melt-processed YBa{sub 2}Cu{sub 3}O{sub x}
Magnetic hysteresis data have been taken at 4.2 and 50 K over a wide range of magnetic fields on melt-textured (MT) and quench-melt-growth-processed (QMGP) YBa{sub 2}Cu{sub 3}O{sub x} samples with 6 vol.% Of Y{sub 2}BaCuO{sub x} (211). In order to obtain accurate comparisons of the intragranular critical current densities, the magnetization measurements were performed on finely powdered samples, the average particle size of which was less than the grain size of the original sample. The QMGP samples exhibited substantially larger hysteresis, indicating significantly enhanced flux pinning at these temperatures. At 4.2 K and 5 T, J{sub c} increase from 4 {times} 10{sup 4} A/cm{sub 2} in the MT sample to 5.5 {times} 10{sup 5} A/cm{sup 2} in the QMGP sample. A possible pinning mechanism related to the observed hysteretic behavior is discussed.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38; FG02-90ER45427
- OSTI ID:
- 10189851
- Report Number(s):
- ANL/CP-77482; CONF-920802-25; ON: DE93001483
- Resource Relation:
- Conference: Applied superconductivity conference,Chicago, IL (United States),23-28 Aug 1992; Other Information: PBD: Aug 1992
- Country of Publication:
- United States
- Language:
- English
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