Spatially resolved studies of metastable and ground state vortex lattice domain dynamics in MgB2
The MgB2 vortex lattice (VL) exhibits significant metastability between highly ordered but differently oriented configurations. The metastability has been clearly demonstrated not to be due to vortex pinning, and we have instead proposed that it may be attributed to VL domain jamming. This jamming hypothesis is supported by our recent measurements using an AC magnetic field to drive the VL to the ground state. This show a cross-over from a slow to a fast power-law behavior, which is speculated to be due to ground state domain nucleation and growth respectively. Here we propose to perform spatially resolved SANS studies to investigate the dynamics of the transition to the VL ground state. Preliminary measurements have demonstrated the feasibility of such measurements, which we will develop further using the D33 multi-beam configuration.
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M. R. Eskildsen; DE WAARD Elizabeth; DEWHURST Charles; KUHN Stephen and WHITE Jonathan. (2014). Spatially resolved studies of metastable and ground state vortex lattice domain dynamics in MgB2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-366
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