Instability of flux flow and production of vortex-antivortex pairs by current-driven Josephson vortices in layered superconductors

Sheikhzada, Ahmad; Gurevich, Alex

doi:10.1103/physrevb.99.214512

Instability of flux flow and production of vortex-antivortex pairs by current-driven Josephson vortices in layered superconductors

Journal Article · Wed Jun 26 00:00:00 EDT 2019 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.99.214512· OSTI ID:1611337

Sheikhzada, Ahmad ^[1]; Gurevich, Alex ^[2]

Old Dominion Univ., Norfolk, VA (United States); DOE/OSTI
Old Dominion Univ., Norfolk, VA (United States)

We report numerical simulations of the nonlinear dynamics of Josephson vortices driven by strong dc currents in layered superconductors. Dynamic equations for interlayer phase differences in a stack of coupled superconducting layers were solved to calculate a drag coefficient η(J) of the vortex as a function of the perpendicular dc current density J. It is shown that Cherenkov radiation produced by a moving vortex causes significant radiation drag increasing η(v) at high vortex velocities v and striking instabilities of driven Josephson vortices moving faster than a terminal velocity v_c. The steady-state flux flow breaks down at v > v_c as the vortex starts producing a cascade of expanding vortex-antivortex pairs evolving into either planar macrovortex structures or branching flux patterns propagating both along and across the layers. This vortex-antivortex pair production triggered by a rapidly moving vortex is most pronounced in a stack of underdamped planar junctions where it can occur at J > J_s well below the interlayer Josephson critical current density. Both v_c and J_s were calculated as functions of the quasiparticle damping parameter, and the dc magnetic field was applied parallel to the layers. The effects of vortex interaction on the Cherenkov instability of moving vortex chains and lattices in annular stacks of Josephson junctions were considered. It is shown that a vortex driven by a current density J > J_s in a multilayer of finite length excites self-sustained large-amplitude standing waves of magnetic flux, resulting in temporal oscillations of the total magnetic moment. We evaluated a contribution of this effect to the power W radiated by the sample and showed that W increases strongly as the number of layers increases. Furthermore, these mechanisms can result in nonlinearity of the c-axis electromagnetic response and contribute to THz radiation from the layered cuprates at high dc current densities flowing perpendicular to the ab planes.

View Accepted Manuscript (DOE)

Research Organization:: Old Dominion Univ., Norfolk, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010081

OSTI ID:: 1611337

Alternate ID(s):: OSTI ID: 1529661

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 99; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Instability of flux flow and production of vortex-antivortex pairs by current-driven Josephson vortices in layered superconductors

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