Brownian dynamics study of driven partially pinned solid in the presence of square array of pinning centers: Enhanced pinning close to the melting transition

Toby Joseph

Physica A: Statistical Mechanics and its Applications, 2020, vol. 556, issue C

Abstract: A set of interacting vortices in 2D in the presence of a substrate with square symmetry and at filling ratio 1 can display a low temperature solid phase where only one of the reciprocal lattice vectors of the substrate is present (Joseph and Dasgupta, 2002), (Fasano et al., 2003). This partially pinned vortex lattice melts to a modulated liquid via a continuous transition (Joseph and Dasgupta, 2002). Brownian dynamics simulation is carried out to study the behavior of driven partially pinned solid at different temperatures. The average vortex velocity for forces above the depinning threshold shows a non-monotonic behavior with temperature, with a minimum in the average velocity close to the melting point. This is reminiscent of the peak effect seen in vortex systems with random disorder. This effect in the current system can be qualitatively explained by an effective increase in the barriers encountered by the particles as Tc is approached. Approximate calculation of the energy barriers as a function of temperature, from the simulation, supports this claim.

Keywords: Driven 2D lattice; Vortex lattice; Periodic pinning; Depinning; Peak effect (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:556:y:2020:i:c:s037843712030368x

DOI: 10.1016/j.physa.2020.124737

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