Abstract
An exact expression for the London free energy of a curved vortex is used to calculate the energy of simple tilting vortex deformations (spiral and planar) in a layered super- conductor which are not assumed to be small in contrast to the usual harmonic approximation. It is shown that contrary to some recent calculations the straight vortex configuration is stable with respect to spiral deformation no matter how large its amplitude is. The results for the t)ting moduli of the vortex lattice are also obtained for the case of vortices inclined With respect to the I axis. mc tion and that the stable configuration is a spiral one. The analysis in (10) is based on exact expression for the free energy of a spiral vortex. If the approach (10) were adequate, previous theoretical results on vortex lattice in anisotropic superconductors would be under question. In the present paper, we obtain exact expressions for the free energy of two possible types of vortex deformation planar and spiral. In case of spiral deformation we show that there are no instabilities of the type predicted in (10). We investigate also the case when a vortex is inclined with respect to the anisotropy axis (E) and find that in all cases straight vortex
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