Internal Vortex Structure Change in a Thin Film for an Unconventional Superconductor

Abstract

The vortex structure of an unconventional superconductor in a thinfilm is investigated using the example of a two-components orderparameter. Under certain conditions such vortices do not posses a normal core. In this case, our theory shows an anomaly in the H_c1 (for fields paralle to the film) as a function oftemperature or film thickness. The origin of this anomaly lies in structural transition of the vortex which leads to thestabilization of fractional vortices in the film.