Flux-line tilt moduli in anisotropic superconductors
A. Sudbø, E. H. Brandt
DOI 10.1103/PhysRevLett.66.1781 · Physical Review Letters
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Abstract
A general expression for the elastic energy of the flux-line lattice (FLL) in anisotropic superconductors is given. From this we derive three tilt moduli c44(k) for the FLL in uniaxial superconductors with induction B∥ and ⊥ to the basal plane. The discreteness of the FLL leads to a logarithmically dispersive isolated-vortex term, which at B≪Bc2 in a large part of the Brillouin-zone area exceeds the usual Lorentzian-dispersive c44(k) originating from the overlapping vortex fields. The difference between vortex self-energy, line tension, and tilt modulus in an anisotropic superconductor is discussed.
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