Cj. Vanderbeek et al., THE EQUILIBRIUM VORTEX STATE IN HEAVY-ION IRRADIATED BI2SR2CACU2O8+DELTA, Physica. C, Superconductivity, 282, 1997, pp. 2101-2102
We obtain the field dependence of the free energy gain due to vortex l
ine pinning by columnar defects in a Bi2Sr2CaCu2O8+delta single crysta
l. Results are discussed in the light of the theoretically proposed Bo
se-glass phase.