Radiation-induced flux pinning in type II superconductors
In monocyrstalline foils of oxygen-doped niobium and niobium--zirconium alloys, statistically distributed or regularly arranged voids were created during irradiation with high-energy /sup 58/Ni/sup +/ ions (3.5 MeV, up to 8.1 x 10/sup 16/ ions/cm/sup 2/) at temperatures between 750 and 900/sup 0/C. The voids exhibit a strong interaction with flux lines, which was determined from measurements of the (anisotropic) critical currents as a function of transverse magnetic field, temperature, and defect geometry. The experimentally determined volume pinning forces obey scaling laws and lead to elementary interaction forces between voids and fluxoids that are larger than theoretical values calculated for various possible mechanisms of interaction. The validity of the statistical summation of elementary forces is discussed.
- Research Organization:
- Institut fuer Metallphysik and Sonderforschungsbereich, University of Goettingen, Germany
- OSTI ID:
- 6979409
- Journal Information:
- J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 32:1; ISSN JLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ATOMIC IONS
CHARGED PARTICLES
COLLISIONS
CRITICAL CURRENT
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CURRENTS
DOPED MATERIALS
ELECTRIC CURRENTS
ELEMENTS
ENERGY RANGE
FOILS
ION COLLISIONS
IONS
MAGNETIC FLUX
METALS
MEV RANGE
MEV RANGE 01-10
NICKEL IONS
NIOBIUM
NIOBIUM ALLOYS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
REFRACTORY METALS
SCALING LAWS
SUPERCONDUCTORS
TRANSITION ELEMENTS
TYPE-II SUPERCONDUCTORS
VACANCIES
VERY HIGH TEMPERATURE
ZIRCONIUM ALLOYS