Vortex lattice (VL) elastic response is analyzed within nonlocal London model. The squash modulus turns zero at the field H□ where VL undergoes square-to-rhombus structural transition. In the field region H>H□ where the square VL is stable, the rotation modulus turns zero at a field Hr indicating instability of the square VL with respect to rotations. The shear modulus depends on the shear direction; the dependence is strong in the vicinity of H□ where the square VL is soft with respect to the shear along [110]. The H dependences of elastic moduli are evaluated for LuNi2B2C.
@article{arxiv.cond-mat/0105630,
title = {Elastic moduli of vortex lattices within nonlocal London model},
author = {P. Miranovic and V. G. Kogan},
journal= {arXiv preprint arXiv:cond-mat/0105630},
year = {2009}
}