Two-dimensional Abrikosov-vortex microclusters: Shell structure and melting |
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Authors: | Yu E Lozovik E A Rakoch |
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Institution: | (1) Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitsk, Moscow District, Russia |
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Abstract: | Melting of two-dimensional Abrikosov-vortex microclusters in a type-II superconductor island with thickness less than the
coherence length has been studied. Equilibrium configurations corresponding to local and global minima of potential energy
for clusters with N=1–50 particles are calculated. The temperature dependences of the structure and of mean-square radial and angular vortex displacements
are investigated. It is shown that vortex microclusters melt in two stages: first the frozen-out phase transfers to a state
corresponding to rotational reorientation of crystalline shells with respect to one another, followed by a transition to a
state with no radial order at a substantially higher temperature. The reason for this is that the barrier to shell rotation
is significantly lower than that to radial breakdown of shells.
Fiz. Tverd. Tela (St. Petersburg) 39, 1005–1010 (June 1997) |
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