Jamming, glassy dynamics and critical slowing down for the metastable VL phases in MgB2
Recently vortex lattice (VL) metastabilty was observed in MgB2. In this material the hexagonal ground state VL rotates continuously as function of field and temperature, between being aligned along the two high symmetry directions in the basal plane. Metastable VL phases can be created by heating or cooling the sample across the onset of the reorientation transition. Once a metastable VL is present, a transition to the ground state can be triggered by a small-amplitude oscillation of the magnetic field. We propose a SANS experiment to investigate the mechanism responsible for the metastability as well as the dynamics of the transition to the ground state. Field-cycling measurements have shown that the transition to ground state is not due to vortex pinning, but due to jamming of VL domains. Preliminary measurements using a transverse AC magnetic field to drive the VL to the ground state showed a power law dependence on the number of cycles applied independent of frequency. This suggests a scaling behavior in further support of VL domain jamming. We propose to search for evidence for a critical slowing down of the metastable to ground state dynamics common in jammed systems.
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M. R. Eskildsen; DEWHURST Charles; RASTOVSKI Catherine and WHITE Jonathan. (2013). Jamming, glassy dynamics and critical slowing down for the metastable VL phases in MgB2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-349
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