Guiding of vortices in YBa2Cu3O7−δ single crystals with unidirected twins

Chabanenko, V. V.; Prodan, A.; Shklovskij, Valerij A.; Bondarenko, A. V.; Obolenskii, M. A.; Szymczak, H.; Piechota, S.

doi:10.1016/s0921-4534(99)00026-x

Cited by 24 publications

(13 citation statements)

References 14 publications

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“…12,18,[23][24][25][26][27][28][29] In this scenario, unlike the Glazman's theory where pinning is irrelevant, the pinning landscape plays a crucial role and the effect should be present even at high fields. All the experimental evidence reported so far ͑mainly on uniaxial pinning͒ shows that near the superconducting-normal transition a single ͑or multiple͒ anomalous peak in the transverse voltage develops.…”

Section: Resultsmentioning

confidence: 93%

Guided vortex motion in superconductors with a square antidot array

et al. 2003

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We have measured the in-plane anisotropy of the vortex mobility in a thin Pb film with a square array of antidots. The Lorentz force, acting on the vortices, was rotated by adding two perpendicular currents and keeping the amplitude of the net current constant. One set of voltage probes was used to detect the vortex motion. We show that the pinning landscape provided by the square antidot lattice influences the vortex motion in two different ways. First, the modulus of the vortex velocity becomes angular dependent with a lower mobility along the diagonals of the pinning array. Second, the vortex displacement is preferentially parallel to the principal axes of the underlying pinning lattice, giving rise to a misalignment between the vortex velocity and the applied Lorentz force. We show that this anisotropic vortex motion is temperature dependent and progressively fades out when approaching the normal state.

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Section: Resultsmentioning

confidence: 93%

Guided vortex motion in superconductors with a square antidot array

et al. 2003

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“…It is already apparent that Nb on a facetted a-Al 2 O 3 M-plane represents a model system for the study of theoretically predicted nonlinear effects in the guiding regime of vortex motion that were previously not accessible to experimental verification. [27,28] In addition, the growth on facetted a-Al 2 O 3 M-planes opens, more generally, a vast array of experimental studies on the way in which the materials properties of thin films are modified by a break in two-dimensional translational symmetry. …”

Section: An Application: Vortex-lattice Matching In Type II Supercondmentioning

confidence: 99%

Highly Ordered Fe and Nb Stripe Arrays on Facetted α-Al2O3 (10$ \bar 1 $0)

Huth¹,

Ritley

Oster

et al. 2002

Adv. Funct. Mater.

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A process is described whereby highly ordered arrays of epitaxial thin‐film nano‐ and mesostripes can be grown using molecular beam epitaxy (MBE) techniques on M‐plane sapphire α‐Al2O3 (10$ \bar 1 $0) substrates. The planar sapphire substrate surface is unstable, and spontaneously forms primarily ($ \bar 1 $101) and (1$ \bar 1 $02) nanofacets upon annealing at a high temperature. By employing this nanofacetted sapphire as a substrate for MBE growth at controlled shallow incident angles, perfect nano‐ and mesostripes can be produced by means of geometrical shadowing in conjunction with partial de‐wetting of the epilayer on the facets. Advantages over other stripe fabrication strategies include: epitaxial quality, tunable width, and the ability to grow superconducting and rare earth nanowires using well‐established MBE techniques. The process is demonstrated by the growth of regular arrays of 100 nm wide Nb nanostripes. Additionally, we have determined the epitaxy of Nb (111) on the Al2O3 ($ \bar 1 $101) facet. The applicability of the periodic defect structure of Nb layers of uniform thickness on the facetted surface is exemplarily demonstrated for the study of the vortex dynamics of type II superconductors.

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“…[28], thin-film of YBCO was prepared through epitaxial growth on oriented bicrystals MgO substrate, producing a misorientation 24° grain boundary. The 100 nm thick film used in this study had superconducting transition temperatures about 86.2 K and critical current densities 3.9 MA/cm 2 .In order to coincide with the simulation, we prepared the sample with an individual GB (=24°) inclined at the angle =30° to the sample edge along x-axis.…”

Section: Methodsmentioning

confidence: 99%

Simulation and experiment of vortex transport properties in a Type II superconductor with grain boundary

Jiang

Hua

et al. 2014

Sci. China Technol. Sci.

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We firstly described a simulation model to investigate the influence of grain boundary (GB) on the vortex transport properties in YBCO film. It is found that the size of inhomogeneous area caused by GB as well as the average velocity in transverse and longitudinal directions shows an angular dependence when the angle  between the GB and the sample edge varies. We have also studied the impact of magnetic field intensity on dynamic behavior of vortex lattice and found that a lower vortex density makes it difficult for the vortex lattice to transfer from pinning state to flow state. As the magnetic field is decreased beyond a critical value, sharp jumps and strong fluctuations were observed in the I-V curve. Finally, we conducted measurements on a thin film YBa 2 Cu 3 O 7 with an individual artificial grain boundary to support the simulation process. high-T c superconductor, grain boundary, vortex dynamic Citation:Jiang L, Xu W W, Hua T, et al. Simulation and experiment of vortex transport properties in a Type II superconductor with grain boundary. Sci China Tech Sci,

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Guiding of vortices in YBa2Cu3O7−δ single crystals with unidirected twins

Cited by 24 publications

References 14 publications

Guided vortex motion in superconductors with a square antidot array

Guided vortex motion in superconductors with a square antidot array

Highly Ordered Fe and Nb Stripe Arrays on Facetted α-Al2O3 (10$ \bar 1 $0)

Simulation and experiment of vortex transport properties in a Type II superconductor with grain boundary

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