Db. Bailey et al., FRACTIONAL VORTICES ON GRAIN-BOUNDARIES - THE CASE FOR BROKEN TIME-REVERSAL SYMMETRY IN HIGH-TEMPERATURE SUPERCONDUCTORS, Physical review. B, Condensed matter, 55(22), 1997, pp. 15239-15247
We discuss the problem of broken time-reversal symmetry near grain bou
ndaries in a d-wave superconductor based on a Ginzburg-Landau theory.
It is shown that such a state can lead to fractional Vortices on the g
rain boundary. Both analytical and numerical results show the structur
e of this type of state.