Abstract
We theoretically examine how a vortex-glass transition in type II superconductors due to point disorder is changed by including line-like disorder. With decreasing field, the resulting glass transition line approaches the (linear) BG transition line BBG(T) of the case with no point disorder, while it deviates upwardly from the BG line with increasing fields and, in high enough fields, approaches the VG transition line BVG(T) of the case with no line disorder. It is argued that this picture will remain valid in clean systems showing the first order transition and a narrow vortex slush region in intermediate fields, and that the slush region will shrink due to an addition of weak line disorder. It is found that the presence of point disorder makes the resulting critical scaling behavior isotropic and, nevertheless, that the resulting glass phase should have the transverse Meissner effect. Results are qualitatively compared with recent resistivity data, and a phase diagram of clean systems with a lower critical point of the first order transition line is suggested.
