Vortex structures, penetration depth and pairing in iron-based superconductors studied by small-angle neutron scattering

Eskildsen, M. R.; Forgan, E. M.; Kawano-Furukawa, Hazuki

doi:10.1088/0034-4885/74/12/124504

Cited by 43 publications

(45 citation statements)

References 77 publications

(116 reference statements)

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“…Like the SL, the superconducting VL leads to a textured, periodic distribution of magnetic field within the body of the material, which is large on the scale of the crystallographic unit cell. In practice, the same experimental techniques that have been successfully applied to probing VL physics, such as small-angle neutron scattering [14] and, in particular, muon-spin rotation (μ + SR) [15,16], could potentially be applied to probe the physics of the SL and this hypothesis forms the basis of the work reported here. In this paper, we investigate the extent to which transverse * tom.lancaster@durham.ac.uk field (TF) μ + SR measurements are sensitive to the skyrmion phase in the multiferroic skyrmion material Cu 2 OSeO 3 .…”

Section: Introductionmentioning

confidence: 99%

Transverse field muon-spin rotation signature of the skyrmion-lattice phase inCu2OSeO3

et al. 2015

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(2015) 'Transverse eld muon-spin rotation signature of the skyrmion-lattice phase in Cu2OSeO3. ', Physical review B., 91 (22). p. 224408.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevB.91.224408Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review B 91, 224408 c 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We present the results of transverse field (TF) muon-spin rotation (μ + SR) measurements on Cu 2 OSeO 3 , which has a skyrmion-lattice (SL) phase. We measure the response of the TF μ + SR signal in that phase along with the surrounding ones, and suggest how the phases might be distinguished using the results of these measurements. Dipole field simulations support the conclusion that the muon is sensitive to the SL via the TF line shape and, based on this interpretation, our measurements suggest that the SL is quasistatic on a time scale τ > 100 ns.

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Section: Introductionmentioning

confidence: 99%

Transverse field muon-spin rotation signature of the skyrmion-lattice phase inCu2OSeO3

et al. 2015

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“…Flux creep parameters in YBCO samples were experimentally investigated by Abulafia et al by utilizing an array of microscopic Hall sensors [36]. Structural properties of vortices in superconductors can be imaged through small-angle neutron scattering [37], a technique that directly measures the Fourier transform of the flux lines' height-height correlation function, and thus accesses their lateral fluctuations reflected in the observables introduced in Section II E. These methods could perhaps be utilized to probe the relaxation processes of magnetic vortex lines in a disordered medium following quenches in temperature or magnetic field, and to distinguish the effects of different types of disorder on the dynamics of this complex system. The initial configuration of randomly placed straight vortices that were implemented in earlier numerical studies cannot be realized in experiments.…”

Section: Introductionmentioning

confidence: 99%

Relaxation dynamics of vortex lines in disordered type-II superconductors following magnetic field and temperature quenches

et al. 2015

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We study the effects of rapid temperature and magnetic field changes on the non-equilibrium relaxation dynamics of magnetic vortex lines in disordered type-II superconductors by employing an elastic line model and performing Langevin molecular dynamics simulations. In a previously equilibrated system, either the temperature is suddenly changed, or the magnetic field is instantaneously altered which is reflected in adding or removing flux lines to or from the system. The subsequent aging properties are investigated in samples with either randomly distributed point-like or extended columnar defects, which allows to distinguish the complex relaxation features that result from either type of pinning centers. One-time observables such as the radius of gyration and the fraction of pinned line elements are employed to characterize steady-state properties, and two-time correlation functions such as the vortex line height autocorrelations and their mean-square displacement are analyzed to study the non-linear stochastic relaxation dynamics in the aging regime.

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“…30 Regarding the iron-based superconductors, the peak effect has been observed in FeAs-1111, [31][32][33] in FeAs-122, [34][35][36][37][38] and in FeTe 1−x Se x , 39 even if a clear understanding of the physical origin of the phenomenon in this family has not been achieved yet. However, since it has been shown by small angle neutron scattering, [40][41][42] Bitter decoration, 40 and magnetic force microscopy 41 that an ordered vortex lattice is not present in these compounds, the origin of the peak effect due to a phase transition of the vortex lattice seems to be excluded.…”

Section: Introductionmentioning

confidence: 99%

Temperature and time scaling of the peak-effect vortex configuration in FeTe0.7Se0.3

et al. 2012

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An extensive study of the magnetic properties of FeTe 0.7 Se 0.3 crystals in the superconducting state is presented. We show that weak collective pinning, originating from spatial variations of the charge carrier mean free path (δl pinning), rules in this superconductor. Our results are compatible with the nanoscale phase separation observed on this compound and indicate that in spite of the chemical inhomogeneity, spatial fluctuations of the critical temperature are not important for pinning. A power-law dependence of the magnetization vs time, generally interpreted as the signature of a single-vortex creep regime, is observed in magnetic fields up to 8 T. For magnetic fields applied along the c axis of the crystal, the magnetization curves exhibit a clear peak effect whose position shifts when varying the temperature, following the same dependence as observed in YBa 2 Cu 3 O 7−δ . The time and temperature dependence of the peak position has been investigated. We observe that the occurrence of the peak at a given magnetic field determines a specific vortex configuration that is independent on the temperature. This result indicates that the influence of the temperature on the vortex-vortex and vortex-defect interactions leading to the peak effect in FeTe 0.7 Se 0.3 is negligible in the explored range of temperatures.

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Vortex structures, penetration depth and pairing in iron-based superconductors studied by small-angle neutron scattering

Cited by 43 publications

References 77 publications

Transverse field muon-spin rotation signature of the skyrmion-lattice phase inCu2OSeO3

Transverse field muon-spin rotation signature of the skyrmion-lattice phase inCu2OSeO3

Relaxation dynamics of vortex lines in disordered type-II superconductors following magnetic field and temperature quenches

Temperature and time scaling of the peak-effect vortex configuration in FeTe0.7Se0.3

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