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Li, L. J.; Nishio, Toshiyuki; Xu, Z. A.; Moshchalkov, Victor

doi:10.1103/physrevb.83.224522

Cited by 35 publications

(55 citation statements)

References 38 publications

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“…The precise information about the characteristic parameters for these materials is not know yet. Also the current experiments suggest that physics of vortex ordering patterns in currently available samples is substantially affected by strong pinning [34][35][36][37][38][39] . We presented here a general study showing that in a three-band system there are many phenomena which are not present in two-band models.…”

Section: Discussionmentioning

confidence: 99%

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

2011

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The recent discovery of iron pnictide superconductors has resulted in a rapidly growing interest in multiband models with more than two bands. In this work we specifically focus on the properties of three-band Ginzburg-Landau models which do not have direct counterparts in more studied two-band models. First we derive normal modes and characteristic length scales in the conventional U (1) three-band Ginzburg-Landau model as well as in its time reversal symmetry broken counterpart with U (1) × Z2 symmetry. We show that in the latter case, the normal modes are mixed phase/density collective excitations. A possibility of the appearance of a massless phase-difference mode associated with fluctuations of the phase difference is also discussed. Next we show that gradients of densities and phase differences can be inextricably intertwined in vortex excitations in three-band models. This can lead to very long-range attractive intervortex interactions and appearance of type-1.5 regimes even when the intercomponent Josephson coupling is large. In some cases it also results in the formation of a domain-like structures in the form of a ring of suppressed density around a vortex across which one of the phases shifts by π. We also show that field-induced vortices can lead to a change of broken symmetry from U (1) to U (1) × Z2 in the system. In the type-1.5 regime, it results in a semi-Meissner state where the system has a macroscopic phase separation in domains with broken U (1) and U (1) × Z2 symmetries.Superconductivity with two gaps associated with different bands was first theoretically predicted in 1959 1 . However it was not until 42 years later, with the discovery of M gB 2 2

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Section: Discussionmentioning

confidence: 99%

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

2011

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“…Strikingly, unconventional vortex pattern formation was recently discovered in multiband type-II superconductors, such as MgB 2 [6] and Sr 2 RuO 4 [7] and ironpnictide materials [8,9], where vortices display chainlike (and/or stripelike) structures in low fields. Although large amount of experimental and theoretical efforts in this field has been made [10][11][12][13][14][15][16][17][18], the nature of the vortex clustering in multiband superconductors is still an intensely controversial issue now [17,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the phase diagram of magnetic vortices in two-dimensional superconductors: evidence for vortex chain formation

Xu¹,

Fangohr²,

Gu³

et al. 2014

J. Phys.: Condens. Matter

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We study the superconducting vortex states induced by the interplay of long-range Pearl repulsion and short-range intervortex attraction using Langevin dynamics simulation. We show that at low temperature the vortices form an ordered Abrikosov lattice both in low and high fields. The vortices show distinctive modulated structures at intermediate fields depending on the effective intervortex attraction: ordered vortex chain and Kogame-like vortex structures for weak attraction; bubble, stripe and antibubble lattices for strong attraction. Moreover, in the regime of the chain state, the vortices display structural transitions from chain to labyrinthine (or disordered chain) and/or to disordered state depending on the strength of disorders.

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“…35 These materials have strong pinning which can naturally produce disordered vortex states, 35 although the possibility of "type-1.5" scenario for these vortex inhomogeneities was also voiced in Ref. 35 .…”

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“…35 . (Note that in three band (or higher number of bands) superconductors with frustrated Josephson coupling, type-1.5 regimes are easily obtainable even if Josephson coupling is very strong.…”

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confidence: 99%

ChiralCP2skyrmions in three-band superconductors

et al. 2013

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It is shown that under certain conditions, three-component superconductors (and in particular three-band systems) allow stable topological defects different from vortices. We demonstrate the existence of these excitations, characterized by a CP 2 topological invariant, in models for threecomponent superconductors with broken time reversal symmetry. We term these topological defects "chiral GL (3) skyrmions", where "chiral" refers to the fact that due to broken time reversal symmetry, these defects come in inequivalent left-and right-handed versions. In certain cases these objects are energetically cheaper than vortices and should be induced by an applied magnetic field. In other situations these skyrmions are metastable states, which can be produced by a quench. Observation of these defects can signal broken time reversal symmetry in three-band superconductors or in Josephson-coupled bilayers of s± and s-wave superconductors.

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Low-field vortex patterns in the multiband BaFe2−xNixAs
L. J. Li
¹
,
Toshiyuki Nishio
²
,
Z. A. Xu
³

et al.

Cited by 35 publications

References 38 publications

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

Simulation of the phase diagram of magnetic vortices in two-dimensional superconductors: evidence for vortex chain formation

ChiralCP2skyrmions in three-band superconductors

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Low-field vortex patterns in the multiband BaFe2−xNixAsL. J. Li1, Toshiyuki Nishio2, Z. A. Xu3 et al.

Cited by 35 publications

References 38 publications

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

Length scales, collective modes, and type-1.5 regimes in three-band superconductors

Simulation of the phase diagram of magnetic vortices in two-dimensional superconductors: evidence for vortex chain formation

ChiralCP2skyrmions in three-band superconductors

Contact Info

Product

Resources

About

Low-field vortex patterns in the multiband BaFe2−xNixAs
L. J. Li
¹
,
Toshiyuki Nishio
²
,
Z. A. Xu
³

et al.