Peak effect and flux pinning in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} single crystals
Thesis/Dissertation
·
OSTI ID:57641
Oxygen annealing studies have been carried out for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} single crystals in order to determine the factors controlling the magnetic field dependence of the flux pinning and critical current densities as a function of oxygen content (7-{delta}). A 300{degrees}C anneal removes much of the damage introduced either during crystal growth or by proton irradiation, but it does not permit substantial oxygen uptake to improve the bulk superfluid density. Anneals at 400{degrees}C result in substantial oxygen uptake accompanied by an overall enhancement in critical current densities with changes in both the overall superfluid density as well as the pinning effects of oxygen defect clusters. Anneals at 500{degrees}C and 550{degrees}C result in a depletion of oxygen content and a resulting overall diminution of critical current densities. The ``fishtail`` shape can be systematically controlled by first adding and then removing oxygen. A model based on the formation and destruction of oxygen point defects and clusters of oxygen defects describes the data rather well.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 57641
- Report Number(s):
- IS-T--1702; ON: DE95010126
- Country of Publication:
- United States
- Language:
- English
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