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Considering that for the unit cell of the Josephson vortex lattice, it is (Formula presented) see also Ref. 28
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Considering that for the unit cell of the Josephson vortex lattice, it is (Formula presented) see also Ref. 28.
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35
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85037913819
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It is important to add that lock-in oscillations point out the exact type of the equilibrium vortex lattice experimentally realized. Indeed, theoretically (Ref. 26) it was found that in the case of a parallel to the layers magnetic field, a degeneracy in the free energy of the realized vortex lattice appears. In other words, the primitive cell of the compressed hexagonal lattice can “point” either along the planes (Fig. 33), with a ratio (Formula presented) or vertically to them (Ref. 26), with (Formula presented) However, in the latter case, when one works out the anisotropy parameters similarly to the way we have described above, the resulting anisotropy values are unphysically low: for example, for sample DT0, we get (Formula presented) and (Formula presented) This observed experimental removal of the degeneracy agrees with earlier reports in uniaxial materials [K. Takanaka, Anisotropy Effects in Superconductors, edited by H. W. Weber (Plenum, New York, 1977), p. 93].
-
It is important to add that lock-in oscillations point out the exact type of the equilibrium vortex lattice experimentally realized. Indeed, theoretically (Ref. 26) it was found that in the case of a parallel to the layers magnetic field, a degeneracy in the free energy of the realized vortex lattice appears. In other words, the primitive cell of the compressed hexagonal lattice can “point” either along the planes (Fig. 33), with a ratio (Formula presented) or vertically to them (Ref. 26), with (Formula presented) However, in the latter case, when one works out the anisotropy parameters similarly to the way we have described above, the resulting anisotropy values are unphysically low: for example, for sample DT0, we get (Formula presented) and (Formula presented) This observed experimental removal of the degeneracy agrees with earlier reports in uniaxial materials [K. Takanaka, Anisotropy Effects in Superconductors, edited by H. W. Weber (Plenum, New York, 1977), p. 93].
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40
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0028482036
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