Title :
The effects of heavy-ion irradiation on superconductivity in YBa/sub 2/Cu/sub 3/O/sub 7/ epitaxial films
Author :
Budhani, R.C. ; Zhu, Y. ; Suenaga, M.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors report a comparative study of superconducting behavior of YBa/sub 2/Cu/sub 3/O/sub 7/ epitaxial films irradiated with Ag and Au ions of several hundred megaelectronvolt energy. The irradiation results in columnar defects of average diameter approximately 55 AA and approximately 110 AA for Ag/sup +21/ and Au/sup +24/ ions, respectively. A universal linear scaling is observed between the fractional areal damage vs. the superconducting transition temperature and normal state resistivity. The results also show that in these films, which have intrinsically strong pinning, a marginal enhancement in the critical current density (J/sub c/) occurs when the defect density is >
Keywords :
barium compounds; critical current density (superconductivity); flux flow; flux pinning; ion beam effects; superconducting epitaxial layers; superconducting transition temperature; yttrium compounds; 110 angstroms; 55 angstroms; Ag ions; Au ions; YBa/sub 2/Cu/sub 3/O/sub 7/ epitaxial films; coherence length; columnar defects; critical current density; defect density; defect diameter; flux flow; fractional areal damage; heavy-ion irradiation; normal state resistivity; pinning force density; superconducting transition temperature; universal linear scaling; Conductivity; Electrons; Gold; High temperature superconductors; Silver; Superconducting epitaxial layers; Superconducting films; Superconducting materials; Superconductivity; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
