Abstract
Flux pinning properties and irreversibility fieldsBirr(T) of melt-textured YBCO with discontinuous or multiple-in-line-damage(MILD) columnar defects produced by irradiation with high-energyU238 ions were studied at a constant matching field ofBϕ = 10 T and for severalenergy losses between Se = 1.67 and 2.4 keV Å−1. Withincreasing Se and increasing length of the MILD pins, the critical current densityjc(H,T) stronglyincreases and Birr(T) forfields along the c axis progressively shifts upwards reaching 9 T at 77 K. ForSe = 2.4 keV Å−1, a pronouncedkink is observed in Birr(T) at 8 T which is a strong indication of Bose-glass behaviour. Thejc(H) dependence of this sample shows a peak at a low applied fieldBp. This peak effect is explained by the entanglement of vortices. It is argued that for MILD pinssingle vortices interact simultaneously with many short columnar defects in neighbouring iontrails resulting in an automatic splay in the vortex orientation. The observed decrease ofBp with increasing temperature is estimated taking the increasing thermal fluctuations intoaccount.
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