Radiation induced flux pinning in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystal
Radiation damage studies have been carried out to determine the changes in superconducting critical current density that result for different choices of radiation direction and magnetic field direction relative to the crystallographic axes. Single crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} were irradiated with 200 MeV protons parallel the a-b plane or to c-axis. These beams created light damage in form of interstitials and voids that subsequently coalesced to clusters of extra atoms in the a-b plane directed along the (100) direction. For low fluence, the main change was in the c-axis critical current density, J{sub c}{sup c}. For fluence in the 10{sup 12}{minus}101{sup 14} protons/cm{sup 2} range, J{sub c}{sup c} showed a major increase whereas the in-plane critical current density, J{sub c}{sup ab} increased much less. There also was a large in-plane anisotropy of J{sub c}{sup c} with J{sub c}{sup c} five to ten times larger for the field parallel to the damage tracks. For fluences in the range of 10{sup 16} protons/cm{sup 2} both J{sub c}{sup c} and J{sub c}{sup ab} showed large increases to values in the 2 {times} 10{sup 6} A/cm{sup 2} range. Annealing studies at room temperature showed that both J{sub c}{sup c} and J{sub c}{sup ab} decreased 20 to 30%.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 10136595
- Report Number(s):
- IS-T-1452; ON: DE93008823
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: Feb 1993
- Country of Publication:
- United States
- Language:
- English
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