Abstract
We numerically examine vortex matter with repulsive interactions at short range and attractive interactions at long range in the presence of periodic pinning arrays. Such competing vortex interactions are predicted to occur in multiband superconductors or type-I and type-II hybrid materials. For weak pinning, the vortices form cluster states, while for strong pinning, the vortices form uniform states in which flux is evenly distributed among the pinning sites. As a function of external drive, the weak pinning system exhibits clump depinning with no structure changes, while the strong pinning system depins into a disordered fluctuating state followed by a transition to a partially aligned stripe state. For weak pinning, there is a single peak in the differential conductivity, while for strong pinning there are two peaks, indicating that transport curves could be used to distinguish between vortex systems with purely repulsive interactions and those with additional long range attractive interactions.
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This work was carried out under the auspices of the NNSA of the US DoE at LANL under Contract No. DE-AC52-06NA25396.
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Reichhardt, C., Drocco, J., Olson Reichhardt, C.J. et al. Statics and Dynamics of Vortex Matter with Competing Repulsive and Attractive Interactions. J Supercond Nov Magn 26, 2041–2044 (2013). https://doi.org/10.1007/s10948-012-2096-x
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DOI: https://doi.org/10.1007/s10948-012-2096-x