期刊
PHYSICAL REVIEW LETTERS
卷 94, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.096401
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We consider the vortices in a superconductor with two individually conserved condensates in a finite magnetic field. The ground state is a lattice of cocentered vortices in both order parameters. We find two phase transitions: (i) a vortex sublattice melting transition where vortices in the field with lowest phase stiffness (light vortices) lose cocentricity with the vortices with large phase stiffness (heavy vortices), entering a liquid state (the structure factor of the light vortices vanishes continuously; this transition is in the 3Dxy universality class); (ii) a first-order melting transition of the lattice of heavy vortices, in a liquid of light vortices.
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