Abstract
Vortex lattices in as-grown and annealed single crystals were studied by high resolution Bitter decoration in fields up to 2000 Oe. The reorientation transition between two different rhombic structures is recorded at in annealed crystals in which the transition to the square lattice occurs at which is lower than for as-grown crystals. A strongly anisotropic orientational order is discovered in the vicinity of These results are discussed in the framework of the nonlocal London model.
- Received 6 August 2001
DOI:https://doi.org/10.1103/PhysRevB.64.220508
©2001 American Physical Society