Origin of peak effect in the magnetization hysteresis loop of melt-processed REBa{sub 2}Cu{sub 3}O{sub y} superconductors
- Defence Metallurgical Research Laboratory, Hyderabad-500 058 (India)
- Tata Institute of Fundamental Research, Colaba, Mumbai-400 005 (India)
- Bhabha Atomic Research Centre, Trombay, Mumbai-400 085 (India)
Melt-processed Sm-123 samples with an excess Sm{sub 2}BaCuO{sub y} (Sm-211) phase is studied by transmission electron microscope (TEM) and superconducting quantum interference device magnetometer, to explain the origin of the peak effect exhibited in the magnetization hysteresis loops of light RE-123 samples in intermediate fields at 77 K. TEM images of the sample showing peak effect reveal dilute concentrations of areas with ortho-II structure distributed on a nanometer scale within the twin regions of the sample. The ortho-II structure is an oxygen deficient 123 with a lower T{sub c} than the bulk of the material and will be a source of flux pinning by turning normal in high fields, thus contributing to the peak effect. With an increase in Sm-211 concentration, the peak effect disappears from the hysteresis loop, as does the ortho-II structure in the TEM images. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 565561
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 71; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structural and superconducting properties of melt grown Y{endash}Ba{endash}Cu{endash}O superconductors
Defects near the Y{sub 2}BaCuO{sub 5}/YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} interface and their effect on flux-pinning in melt- processed and quench-melt-growth processed YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}
Defects near the Y sub 2 BaCuO sub 5 /YBa sub 2 Cu sub 3 O sub 7 minus x interface and their effect on flux-pinning in melt- processed and quench-melt-growth processed YBa sub 2 Cu sub 3 O sub 7 minus x
Journal Article
·
Tue Oct 01 00:00:00 EDT 1996
· Journal of Materials Research
·
OSTI ID:389277
Defects near the Y{sub 2}BaCuO{sub 5}/YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} interface and their effect on flux-pinning in melt- processed and quench-melt-growth processed YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}
Conference
·
Mon Jun 01 00:00:00 EDT 1992
·
OSTI ID:10150795
Defects near the Y sub 2 BaCuO sub 5 /YBa sub 2 Cu sub 3 O sub 7 minus x interface and their effect on flux-pinning in melt- processed and quench-melt-growth processed YBa sub 2 Cu sub 3 O sub 7 minus x
Conference
·
Tue Dec 31 23:00:00 EST 1991
·
OSTI ID:5192766