Field evolution of vortex lattice in LuNi2B2C seen by decoration in fieldsup to 1.5 kOe - art. no. 024504

Evolution of the vortex lattice, the rhombus-square transition included, fo r LuNi2B2C in the field along the c crystal axis, is tracked by the decorat ion technique pushed up to the record high (for this method) field of. 1480 Oe. Decoration images are analyzed with the help of the Fourier transform, which indicates disordered structures in small fields of a few Oe. In fiel ds H<200 Oe the coexisting domains of different structures are observed. A technique based on the Fourier transform is employed to see the domains sep arately. The transition to the square lattice is recorded near 900 Oe. The results are in agreement with predictions of the nonlocal London theory.