Arresting vortex motion in YBaCuO crystals with splay in columnar defects

1994 
Results show that the splay in the orientation of the columnar defects (produced by heavy ion irradiation) has a significant effect on dynamics of the vortices. 0.58 GeV {sup 116}Sn{sup 30+} and 1.08 GeV {sup 197}Au{sup 23+} ions were used to irradiated YBaCuO single crystals. At high temperatures, the larger splay of the Sn tracks (10{degree}) results in a current density one order of magnitude larger and a creep rate on order of magnitude smaller than the Au irradiation (1{degree}). This indicates that a considerable further improvement of the current carrying capacity of high temperature superconductors can still be obtained.
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