Shear modulus in the ground state of interlayer Josephson vortex systems

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The field dependence of the shear modulus c66 in interlayer Josephson vortex┬ásystems in the ground state is investigated on the basis of the Lawrence–Doniach (LD) model. While c66 was predicted to vanish exponentially as the external field increases for high fields in the London model, this quantity actually converges to a nonvanishing value for high fields in a simplified LD model without spatial dependence of the magnetic field and the amplitude of the superconducting order parameter. Such field independence of c66 also holds when the spatial dependence of these quantities is taken into account. We also find that the shear instability field increases significantly when spatial dependence of the magnetic field is introduced, and that Hc2 becomes infinite for &\xi_{\mathrm {c}}\lt d/\sqrt {2} ; when spatial dependence of the amplitude of the superconducting order parameter is considered.

Document Type: Research Article


Publication date: February 1, 2007

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