Structure of the Fulde-Ferrell-Larkin-Ovchinnikov state in two-dimensional superconductors

Physics – Condensed Matter – Superconductivity

Scientific paper

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11 pages (LaTeX, revtex.sty), 3 figures; added references

Scientific paper

10.1143/JPSJ.67.736

Nonuniform superconducting state due to strong spin magnetism is studied in two-dimensional type-II superconductors near the second order phase transition line between the normal and the superconducting states. The optimum spatial structure of the orderparameter is examined in systems with cylindrical symmetric Fermi surfaces. It is found that states with two-dimensional structures have lower free energies than the traditional one-dimensional solutions, at low temperatures and high magnetic fields. For s-wave pairing, triangular, square, hexagonal states are favored depending on the temperature, while square states are favored at low temperatures for d-wave pairing. In these states, orderparameters have two-dimensional structures such as square and triangular lattices.

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