Local spin-density-wave order inside vortex cores in multiband superconductors

Abstract

Coexistence of antiferromagnetic order with superconductivity in many families of newly discovered iron-based superconductors has renewed interest to this old problem. Due to competition between the two types of order, one can expect appearance of the antiferromagnetism inside the cores of the vortices generated by the external magnetic field. The structure of a vortex in type II superconductors holds significant importance from the theoretical and the application points of view. Here we consider the internal vortex structure in a two-band s± superconductor near a spindensity-wave instability. We treat the problem in a completely self-consistent manner within the quasiclassical Eilenberger formalism. We study the structure of the s± superconducting order and magnetic field-induced spin-density-wave order near an isolated vortex. We examine the effect of this spin-density-wave state inside the vortex cores on the local density of states.

Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe1−xCox)2As2

“…( 2) and (3), implies that a 1 (T, x) a 2 (T, x) and also a 1 (T, x) > 1, so that within the experimentally relevant range of fields, the ratio of the viscosity coefficient to magnetic field, hence σ ff , increases with increasing h. One aspect of the flux-flow in multiband superconductors, which have not been addressed so far, is concerning the presence of magnetic order in the vortex cores. In this regard, it has been shown recently that SDW order can emerge inside the vortex cores in the iron-based superconductors [29]. As a consequence, one may speculate that the onset of the SDW order inside the vortex core affects the drag force and results in the magnetic field dependence of the drag coefficient.…”