Vortex shear banding transitions in superconductors with inhomogeneous pinning arrays

Reichhardt, C.; Reichhardt, C. J. O.

doi:10.1088/2399-6528/ab5e66

Vortex shear banding transitions in superconductors with inhomogeneous pinning arrays

Journal Article · Tue Dec 17 23:00:00 EST 2019 · Journal of Physics Communications

DOI:https://doi.org/10.1088/2399-6528/ab5e66· OSTI ID:1579773

Reichhardt, C.;

Abstract

We numerically examine the flow of superconducting vortices in samples containing square pinning arrays in which a band of pins is removed. When a drive is applied at an angle with respect to the band orientation, we find that the vortex depinning initiates in the pin-free channel. The moving vortices form a series of quasi-one-dimensional shear bands that begin flowing in the bulk of the pin-free channel, and the motion gradually approaches the edge of the pinned region. The consecutive depinning of each shear band appears as a series of jumps in the velocity-force curves and as sharp steps in the spatial velocity profiles. When a constant drive is applied parallel to the pin-free channel along with a gradually increasing perpendicular drive, the net vortex velocity decreases in a series of steps that correspond to the immobilization of bands of vortices, and in some cases the flow can drop to zero, creating a field effect transistor phenomenon. These results should also be relevant to other types of systems that exhibit depinning in the presence of inhomogeneous pinning.

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Sponsoring Organization:: USDOE

OSTI ID:: 1579773

Alternate ID(s):: OSTI ID: 1784695
OSTI ID: 22981090

Journal Information:: Journal of Physics Communications, Journal Name: Journal of Physics Communications Journal Issue: 12 Vol. 3; ISSN 2399-6528

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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