“…( 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.…”