Square vortex lattice

For LuNi2B2C as well as YNi2B2C, at sufficiently high fields applied parallel to the tetragonal c axis, square vortex lattices as shown in the figs 51a and 52 have been observed (De Wilde et al. 1997 Yethiraj et al. 1997, 1998 Paul et al. 1998 Ghosh and Shrivastiava... 

The elastic moduli of the vortex lattice around the transition field H j of have been analyzed within the nonlocal London model by Miranovic and Kogan (2001). In particular, the square vortex lattice was found to be soft with respect to shear displacement along the square sides [110] or [110]. 

The anisotropy of the Fermi surface (with its four-fold symmetry of the Fermi velocity) is not only responsible for the square vortex lattice Dp, but also for the... 

---