Abstract
We report on vortex manipulation experiments which exploit the attractive interaction between ‘crossing’ pancake vortex (PV) and Josephson vortex (JV) lattices in Bi 2Sr 2CaCu 2O 8+ δ (BSCCO) single crystals under tilted magnetic fields. Deformations of the JV lattice allow us to indirectly move mutually interacting PVs. In dc-driven mode the in-plane field is varied slowly (adiabatically) while the PV density is monitored at different points in our single crystal BSCCO sample using a micro-Hall probe array. Variations in PV density as large as 40% have been demonstrated in this way and both enhancement and depletion are observed, depending on the location in the crystal, temperature and PV density. In ac-driven experiments, manipulation is achieved by applying trains of time-asymmetric (sawtooth) in-plane field pulses. We show how both flux focusing and defocussing can be readily achieved merely by varying the time-asymmetry of the drive. Our experimental results are well described by molecular dynamics simulations which consider the dragging of PVs by JVs.
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