S. Nieber et H. Kronmuller, ELASTIC PROPERTIES OF THE FLUX-LINE-LATTICE IN HIGH-T(C)-SUPERCONDUCTORS, Physica. C, Superconductivity, 213(1-2), 1993, pp. 43-50
The elastic matrix, governing the non-local elastic properties of the
flux line lattice, is derived within the anisotropic London theory for
an arbitrary arrangement of straight or curved vortices in uniaxial h
igh-T(c) superconductors. The non-local elastic moduli for compression
, shear and tilt of the flux line lattice in YBa2Cu3O7-delta and Bi2Sr
2CaCu2O8+delta are numerically calculated for magnetic fields of vario
us strengths applied parallel and perpendicular to the c-axis. The con
ventional hexagonal flux line lattice becomes soft for certain compres
sion and shear modes with wave vectors near the boundary of the Brillo
uin zone. A comparison of the numerical results with the isotropic app
roximation is made and analytical expressions for the line tension of
single flux lines oriented along one of the main axes are given.