Dynamics of Domain Walls in a Fulde–Ferrell Superconductor

Plastovets, V. D.; Vodolazov, D. Yu.

doi:10.1134/s0021364019110122

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…5(b)) and ground states (J z ↑↓ q z with critical current J c2 ) [35]. The transition from the metastable state to the ground state with change of the current in the range −J c2 < J < J c2 is accompanied by large variation of q z (it changes value and sign) when |J| exceeds J c1 and appearance of moving electric domain [36]. Applying ac current at V ctrl < V F F with amplitude J < J c2 = J c (at this control voltage there exist only one critical current) leads to mainly inductive response with the voltage shifted by π/2 from the current.…”

Section: (B)mentioning

confidence: 99%

Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge

Levichev,

Pashenkin,

Gusev

et al. 2021

Preprint

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We study voltage controllable superconducting state in multi-terminal bridge composed of the dirty superconductor/pure normal metal (SN) bilayer and pure normal metal. In the proposed system small control current I ctrl flows via normal bridge, creates voltage drop V and modifies distribution function of electrons in connected SN bilayer. In case of long normal bridge the voltage induced nonequilibrium effects could be interpreted in terms of increased local electron temperature. In this limit we experimentally find large sensitivity of critical curent Ic of Cu/MoN/Pt-Cu bridge to I ctrl and relatively large current gain which originate from steep dependence of Ic on temperature and large Ic (comparable with theoretical depairing current of superconducting bridge). In the short normal bridge deviation from equilibrium cannot be described by simple increase of local temperature but we also theoretically find large sensitivity of Ic to control current/voltage. In this limit we predict existence at finite V of so called in-plane Fulde-Ferrell state with spontaneous currents in SN bilayer. We argue that its appearance is connected with voltage induced paramagnetic response in N layer.

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Section: (B)mentioning

confidence: 99%

Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge

Levichev,

Pashenkin,

Gusev

et al. 2021

Preprint

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“…2(c)). In 'onion' state the diagonal distribution of q minimizes the positive contribution to the free energy which comes from vanishing of q| n at the edge 17 . In homogenous and quasi-1D FF states the current density is equal to zero, while in the vortex and 'onion' states it is finite (see Fig.…”

Section: Ginzburg-landau Approachmentioning

confidence: 99%

“…In Refs. 16,17 it was found, that such a modification occurs on scale about of 1/q F F and it leads to increase of the free energy F. Therefore when Lq F F ∼ 1 this increase of free energy may exceed the energy gain from transition to modulated state and homogenous state becomes more favorable. Support to this comes from Ref.…”

Section: Introductionmentioning

confidence: 99%

“…1 is rather complicated and time-consumable problem. Therefore we use 2D modified phenomenological Ginzburg-Landau (GL) equation (see appendix A) for thickness averaged superconducting order parameter Ψ which qualitatively well describes main properties of FF superconductor 16,17,19 and allows us to find arbitrary in-plane distribution of Ψ, λ −2 and sheet current density. Besides we use 2D Usadel equation (with radial and z dependence) for SFN disk where we consider only circularly symmetric (vortex) and spatially homogenous states.…”

Section: Introductionmentioning

confidence: 99%

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Paramagnetic Meissner, vortex and 'onion' ground states in Fulde-Ferrell finite-size superconductor

Plastovets,

Vodolazov

2020

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We theoretically find that finite size Fulde-Ferrell (FF) superconductor (which is characterized by spatially nonuniform ground state Ψ ∼ exp(−iqF F r) and |Ψ|(r) = const in the bulk case, where Ψ is a superconducting order parameter) has paramagnetic Meissner, vortex and 'onion' ground states with |Ψ|(r) = const. These states are realized due to boundary effect when the lateral size of superconductor L ∼ 1/qF F . We argue, that predicted states could be observed in thin disk/square made of superconductor-ferromagnet-normal metal trilayer with L ≃ 150 − 600nm.

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“…where Ψ is a complex superconducting order parameter and Π y,z = ∇ y,z + i2πA y,z /Φ 0 . One has to define the signs of phenomenological parameters: α, γ < 0 and β, δ > 0 to have Fulde-Ferrell state as a ground one [27,28].…”

Section: Modelmentioning

confidence: 99%

Magnetic field induced global paramagnetic response in Fulde-Ferrell superconducting strip

Marychev¹,

Plastovets²,

Vodolazov³

2020

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We theoretically study magnetic response of a superconductor/ferromagnet/normal-metal (SFN) strip in an in-plane Fulde-Ferrell (FF) state. We show that unlike to ordinary superconducting strip the FF strip can be switched from diamagnetic to paramagnetic and then back to diamagnetic state by increasing the perpendicular magnetic field. Being in paramagnetic state FF strip exhibits magnetic field driven second order phase transition from FF state to the ordinary state without spatial modulation along the strip. We argue that the global paramagnetic response is connected with peculiar dependence of sheet superconducting current density on supervelocity in FF state and it exists in nonlinear regime.

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Dynamics of Domain Walls in a Fulde–Ferrell Superconductor

Cited by 8 publications

References 12 publications

Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge

Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge

Paramagnetic Meissner, vortex and 'onion' ground states in Fulde-Ferrell finite-size superconductor

Magnetic field induced global paramagnetic response in Fulde-Ferrell superconducting strip

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