Dissociation Transition of a Composite Lattice of Magnetic Vortices in the Flux-Flow Regime of Two-Band Superconductors

Abstract

In multiband superconductors, each superconducting condensate supports vortices with fractional quantum flux. In the ground state, vortices in different bands are spatially bounded together to form a composite vortex, carrying one quantum flux Φ_0. Here we predict dissociation of the composite vortices lattice in the flux flow state due to the disparity of the vortex viscosity and flux of the vortex in different bands. For a small driving current, composite vortices start to deform, but the constituting vortices in different bands move with the same velocity. For a large current, composite vortices dissociate and vortices in different bands move with different velocities. The dissociation transition shows up as an increase of flux flow resistivity. In the dissociated phase, Shapiro steps are developed when an ac current is superimposed with a dc current.

arXiv comment4.5 pages, 3 figures

References in corpus (21)

• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Vortices with fractional flux in two-gap superconductors and in extended Faddeev model
• Type-1.5 Superconductors
• Semi-Meissner state and neither type-I nor type-II superconductivity in multicomponent systems
• Observation of Leggett's collective mode in a multi-band MgB2 superconductor
• Superfluid density and specific heat within self-consistent scheme for two-band superconductor
• Evolution of two-gap behavior of the superconductor FeSe_1-x
• Extended Ginzburg-Landau formalism for two-band superconductors
• Intrinsic Josephson effect and nonequilibrium soliton structures in two-gap superconductors
• Magnetic response of mesoscopic superconducting rings with two order parameters
• Two-band superconductors: Hidden criticality deep in the superconducting state
• Massless Leggett Mode in Three-band Superconductors with Time-Reversal-Symmetry Breaking
• Is the term "type-1.5 superconductivity" warranted by Ginzburg-Landau theory?
• Stable fractional flux vortices in mesoscopic superconductors
• Phase textures induced by dc current pairbreaking in multilayer structures and two-gap superconductors
• Different length-scales for order parameters in two-gap superconductors: the extended Ginzburg-Landau theory
• Two-band superconductors: Extended Ginzburg-Landau formalism by a systematic expansion in small deviation from the critical temperature
• Stable fractional flux vortices and unconventional magnetic state in two-component superconductors
• Vortex sub-lattice melting in a two-component superconductor
• Stability of fractional vortex states in a two-band mesoscopic superconductor
• Dynamic melting of confined vortex matter

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• Distinct magnetic signatures of fractional vortex configurations in multiband superconductors
• Strain-induced inter-vortex interaction and vortex lattices in tetragonal superconductors
• Exceptional Suppression of Flux-Flow Resistivity in FeSe${}_{0.4}$Te${}_{0.6}$ by Back-Flow from Excess Fe Atoms and Se/Te Substitutions
• Vortex motion and flux-flow resistivity in dirty multiband superconductors
• Dynamical Josephson Effects in NbSe${}_2$
• Superconductors that do not expel magnetic flux
• Microwave flux-flow Hall effect in a multi-band superconductor FeSe
• DC-driven separation of fractional flux quanta in two-band superconductors
• Crystallized and amorphous vortices in rotating atomic-molecular Bose-Einstein condensates