Tilt-wave instability of the flux-line lattice in anisotropic superconductors

Edson Sardella; M. A. Moore

doi:10.1103/PhysRevB.48.9664

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Tilt-wave instability of the flux-line lattice in anisotropic superconductors

Edson Sardella, M. A. Moore

DOI 10.1103/PhysRevB.48.9664 · Physical Review B

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Abstract

The stability of the Abrikosov flux-line lattice for uniaxially anisotropic superconductors has been studied in the London approximation as a function of the anisotropic mass ratio and the angle θ between the B field and crystal c axis. For anisotropic mass ratio Mc/Mab larger than (3+ √8 ) and for a range of angles θc1<θ<θc2, the straight flux lines become unstable and a tilt-wave instability occurs, irrespective of the magnitude of the B field. We show that this instability occurs for a variety of cutoff schemes (which are needed to make London theory finite). The instability is probably related to the formation of a ‘‘combined’’ lattice of flux lines in which two species of vortices coexist simultaneously but run in different directions.