Lattices of double-quanta vortices and chirality inversion in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>p</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>+</mml:mo><mml:mi>i</mml:mi><mml:msub><mml:mi>p</mml:mi><mml:mi>y</mml:mi></mml:msub></mml:mrow></mml:math>superconductors

Garaud, Julien; Babaev, Egor; Bojesen, Troels Arnfred; Sudbø, Asle

doi:10.1103/physrevb.94.104509

Cited by 19 publications

(37 citation statements)

References 61 publications

(120 reference statements)

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“…Third, Ichioka et al [46] used the time-dependent Ginzburg-Landau theory to study the magnetization process and found that with increasing magnetic fields, the domain walls move so that the unstable domains shrink to vanishing size, and the single-domain structure is realized at higher fields. Along these lines there are theories of doubly quantized vortices and other exotic behaviours that may lead to a broken field with nonzero chirality degeneracy [47,48]. Note that compared to the first proposal, chiral domain wall pinning is not emphasized, which to some extent suggests pinning by domains themselves and is probably more relevant to our observations here.…”

Section: Discussionmentioning

confidence: 58%

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

et al. 2017

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Sr 2 RuO 4 (SRO) is the prime candidate for a chiral p-wave superconductor with critical temperaturẽ ( ) T SRO 1.5 c K. Chiral domains with opposite chiralities  p p i x y have been proposed, but are yet to be confirmed. We measure the field dependence of the point contact (PC) resistance between a tungsten tip and an SRO-Ru eutectic crystal, where micrometer-sized Ru inclusions are embedded in SRO with an atomically sharp interface. Ruthenium is an s-wave superconductor with( ) T Ru 0.5 c K; flux pinned near the Ru inclusions can suppress its superconductivity, as reflected in the PC resistance and spectra. This flux pinning effect originates from SRO underneath the surface and is very strong once flux is introduced. To fully remove flux pinning, one needs to thermally cycle the sample above T c (SRO) or apply alternating fields with decreasing amplitude. With alternating fields, the observed hysteresis in magnetoresistance can be explained by domain dynamics, providing support for the existence of chiral domains. The origin of the strong pinning could be the chiral domains themselves.

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Section: Discussionmentioning

confidence: 58%

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

et al. 2017

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“…This is important to ensure that vortex matter do not interact with the domain boundaries and thus that the obtained configurations are not artifacts of boundary interactions. In particular, in the results that are displayed below, the numerical grid is larger than the displayed region which are close up views of the regions carrying vortices [35]. Note also that here we are interested in the physical properties of the vortex matter, such as intervortex forces, rather than magnetization process.…”

Section: Vortices In the Vicinity Of The S + Is Region Physics Bmentioning

confidence: 96%

Properties of dirty two-band superconductors with repulsive interband interaction: Normal modes, length scales, vortices, and magnetic response

et al. 2018

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Publisher's PDF Garaud, Julien; Corticelli, Alberto; Silaev, Mikhail; Babaev, Egor Garaud, J., Corticelli, A., Silaev, M., & Babaev, E. (2018) Disorder in two-band superconductors with repulsive interband interaction induces a frustrated competition between the phase-locking preferences of the various potential and kinetic terms. This frustrated interaction can result in the formation of an s + is superconducting state that breaks the time-reversal symmetry. In this paper we study the normal modes and their associated coherence lengths in such materials. We especially focus on the consequences of the soft modes stemming from the frustration and time-reversal symmetry breakdown. We find that two-band superconductors with such impurity-induced frustrated interactions display a rich spectrum of physical properties that are absent in their clean counterparts. It features a mixing of Leggett's and Anderson-Higgs modes, and a soft mode with diverging coherence length at the impurity-induced second-order phase transition from s ± /s ++ states to the s + is state. Such a soft mode generically results in long-range attractive intervortex forces that can trigger the formation of vortex clusters. We find that, if such clusters are formed, their size and internal flux density have a characteristic temperature dependence that could be probed in muon-spin-rotation experiments. We also comment on the appearance of spontaneous magnetic fields due to spatially varying impurities.

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“…For that purpose, the vortices are induced only by the initial configuration of the phase winding. For further details on the numerical methods employed here, see for example the related discussion in [20]. Figure 2 shows the numerically calculated (isolated) vortex solutions in the vicinity of the impurity-induced crossover, in the case of a two-band superconductor with nearly degenerate bands and weak repulsive interband pairing interaction.…”

Section: Structural Transition Of Vortex Coresmentioning

confidence: 99%

Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors

et al. 2018

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In multiband systems, such as iron-based superconductors, the superconducting states with locking and anti-locking of the interband phase differences, are usually considered as mutually exclusive. For example, a dirty two-band system with interband impurity scattering undergoes a sharp crossover between the s± state (which favors phase anti locking) and the s++ state (which favors phase locking). We discuss here that the situation can be much more complex in the presence of an external field or superconducting currents. In an external applied magnetic field, dirty two-band superconductors do not feature a sharp s± → s++ crossover but rather a washed-out crossover to a finite region in the parameter space where both s± and s++ states can coexist for example as a lattice or a microemulsion of inclusions of different states. The current-carrying regions such as the regions near vortex cores can exhibit an s± state while it is the s++ state that is favored in the bulk. This coexistence of both states can even be realized in the Meissner state at the domain's boundaries featuring Meissner currents. We demonstrate that there is a magnetic-field-driven crossover between the pure s± and the s++ states.

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Lattices of double-quanta vortices and chirality inversion inpx+ipysuperconductors

Cited by 19 publications

References 61 publications

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Properties of dirty two-band superconductors with repulsive interband interaction: Normal modes, length scales, vortices, and magnetic response

Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors

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Lattices of double-quanta vortices and chirality inversion inpx+ipysuperconductors

Cited by 19 publications

References 61 publications

Probing chiral superconductivity in Sr2RuO4underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr2RuO4underneaththe surface by point contact measurements

Properties of dirty two-band superconductors with repulsive interband interaction: Normal modes, length scales, vortices, and magnetic response

Field-induced coexistence of s++ and s± superconducting states in dirty multiband superconductors

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Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements

Probing chiral superconductivity in Sr₂RuO₄underneaththe surface by point contact measurements