Title: Paramagnetic Meissner effect in ZrB12 single crystal with non-monotonic vortex-vortex interactions,
Abstract: The magnetic response related to paramagnetic Meissner effect (PME) is
studied in a high quality single crystal ZrB12 with non-monotonic vortex-vortex
interactions. We observe the expulsion and penetration of magnetic flux in the
form of vortex clusters with increasing temperature. A vortex phase diagram is
constructed which shows that the PME can be explained by considering the
interplay among the flux compression, the different temperature dependencies of
the vortex-vortex and the vortex-pin interactions, and thermal fluctuations.
Such a scenario is in good agreement with the results of the magnetic
relaxation measurements.