4 research outputs found
Modulated vortex states in Rashba non-centrosymmetric superconductors
Vortex lattice structures to occur in Rashba non-centrosymmetric
superconductors under a magnetic field parallel to the basal plane are studied
by assuming a singlet Cooper pairing and taking account of both the
paramagnetic and orbital depairings. A vortex lattice of
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) type with modulation perpendicular to
the field is expected to occur in the limit of vanishing , where
is the spin-orbit coupling {\it normalized} by Fermi energy. As
increases, however, this state tends to be replaced by another
new vortex lattice with a modulation of the gap amplitude parallel to the
helical phase modulation induced by the absence of inversion symmetry.
Differences of the present results from those in the Pauli limit and a
correlation of a structural transition with the -curve are discussed
in relation to possible experimental realization.Comment: Final version accepted for publication in Phys.Rev.B (Rapid Commmun.