Abstract
The ground state of interlayer Josephson vortex systems is investigated on the basis of the Lawrence–Doniach model. First, spatial dependence of the magnetic field and the amplitude of superconducting order parameter is neglected, and full energy landscape is drawn with respect to the in-plane-field, the period of insulating layers including Josephson vortices, and the shift from the aligned vortex lattice. The energy landscape has a multi-valley structure, and rotated-lattice ground-state configurations correspond to bifurcation points of the valleys. Next, spatial dependence of the magnetic field (the screening effect) is introduced. While rotated-lattice configurations are found to be almost unchanged, the shear-instability field increases as the screening effect increases.
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