Rotational transition, domain formation, dislocations, and defects in vortex systems with combined sixfold and twelvefold anisotropic interactions

Olszewski, Maciej; Eskildsen, M. R.; Reichhardt, C.

doi:10.1103/physrevb.101.224504

Cited by 8 publications

(17 citation statements)

References 68 publications

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“…Recently, point particle models incorporating twofold, four-fold, and six-fold anisotropic interactions have been considered in the context of triangular to square and other vortex lattice rotational transitions [50,51]. This work used a vortex-vortex interaction potential with n a anisotropy axes,…”

Section: Methodsmentioning

confidence: 99%

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

2022

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We examine the dynamics of superconducting vortices with two-fold anisotropic interaction potentials driven over random pinning, and compare the behavior under drives applied along the hard and the soft anisotropy directions. As the driving force increases, the number of topological defects reaches a maximum near the depinning threshold, and then decreases as the vortices form one-dimensional chains. This coincides with a transition from a pinned nematic to a moving smectic aligned with the soft anisotropy direction. The system is generally more ordered when the drive is applied along the soft direction of the anisotropy. For driving along the hard direction, there is a critical value of the twofold anisotropy above which the system remains aligned with the soft direction. Hysteretic behavior appears upon cycling the driving force, with one-dimensional vortex chains persisting during the decreasing leg below the threshold for chain formation for increasing drive. More anisotropic systems have a greater amount of structural disorder in the moving state. For lower anisotropy, the system forms a moving smectic-A state, while at higher anisotropy, a moving nematic state appears instead.

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Section: Methodsmentioning

confidence: 99%

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

2022

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“…a triangular ground state in the absence of quenched disorder. Point particle models of vortices with two-fold, four-fold, and six-fold anisotropic interactions have also been considered [48,49] in the context of triangular to square and other rotational transitions. In anisotropic systems with a total of n a anisotropy axes, the vortexvortex interaction potential has the form…”

Section: Methodsmentioning

confidence: 99%

Driven Superconducting Vortex Dynamics in Systems with Two-Fold Anisotropy in the Presence of Pinning

Roe,

Eskildsen,

Reichhardt

et al. 2022

Preprint

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We examine the dynamics of superconducting vortices with twofold anisotropic interaction potentials driven over random pinning and compare the behavior under drives applied parallel and perpendicular to the anisotropy direction. The number of topological defects reaches a maximum near depinning and then drops with increasing driving force as the vortices form one-dimensional chains. This coincides with a transition from a pinned nematic to a moving smectic aligned with the soft direction of the anisotropy. The system is generally more ordered when the drive is applied along the soft direction of the anisotropy, while for driving along the hard direction, there is a critical value of the anisotropy above which the system remains aligned with the soft direction. We also observe hysteresis in the dynamics, with one-dimensional aligned chains persisting during a decreasing drive sweep to drives below the threshold for chain formation during the increasing drive sweep. More anisotropic systems have a greater amount of structural disorder in the moving state. For lower anisotropy, the system forms a moving smectic-A state, while at higher anisotropy, a moving nematic state appears instead.

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“…In the intermediate L phase, the VL undergoes a continuous 30 rotation transition between these two high-symmetry directions within the hexagonal crystalline basal plane. The VL rotation is due to the field-and temperature-dependent supercarrier density within the and bands in MgB 2 , resulting in a change of the relative strength of their competing anisotropies (Zhitomirsky & Dao, 2004;Hirano et al, 2013;Olszewski et al, 2020). The VL phase diagram can be tuned by rotating the applied field away from the c axis, which first suppresses and eventually eliminates the intermediate L phase, and leads to a discontinuous transition between the F and I phases (Leishman et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic and non-magnetic doping on the vortex lattice in MgB₂

Louden¹,

Manni²,

Zandt³

et al. 2022

J Appl Cryst

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Small-angle neutron scattering has been used to study the vortex lattice in superconducting MgB2 doped with either manganese or carbon to achieve a similar suppression of the critical temperature. Measurements were performed with the magnetic field applied along the c axis, where the vortex lattice in pure MgB2 is known to undergo a field- and temperature-driven 30° rotation transition. For Mn doping, the vortex lattice phase diagram remains qualitatively similar to that of pure MgB2, indicating only a modest effect on the vortex–vortex interaction. In contrast, the vortex lattice rotation transition is completely suppressed in the C-doped case, probably due to a change in the electronic structure which affects the two-band/two-gap nature of superconductivity in MgB2. The vortex lattice longitudinal correlation length shows the opposite behavior, remaining roughly unchanged between pure and C-doped MgB2 while it is significantly reduced in the Mn-doped case. However, the extensive vortex lattice metastability and related activated behavior, observed in conjunction with the vortex lattice transition in pure MgB2, are also seen in the Mn-doped sample. This shows that the vortex lattice disordering is not associated with a substantially increased vortex pinning.

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Rotational transition, domain formation, dislocations, and defects in vortex systems with combined sixfold and twelvefold anisotropic interactions

Cited by 8 publications

References 68 publications

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

Driven Superconducting Vortex Dynamics in Systems with Two-Fold Anisotropy in the Presence of Pinning

Effects of magnetic and non-magnetic doping on the vortex lattice in MgB₂

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Rotational transition, domain formation, dislocations, and defects in vortex systems with combined sixfold and twelvefold anisotropic interactions

Cited by 8 publications

References 68 publications

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

Driven Superconducting Vortex Dynamics in Systems with Two-Fold Anisotropy in the Presence of Pinning

Effects of magnetic and non-magnetic doping on the vortex lattice in MgB2

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Product

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Effects of magnetic and non-magnetic doping on the vortex lattice in MgB₂