Vortex state in thermally-induced pinning patterns in superconducting film

González, J D; Joya, M. R.; Barba-Ortega, J.

doi:10.1016/j.physleta.2018.07.047

Cited by 7 publications

(3 citation statements)

References 48 publications

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“…Moreover, uniform vortex configurations are recovered by heating the system globally above T c and cooling in the absence of laser (see SI, Figure S9). Recently, thermal gradients arising from focused laser beams have achieved patterning at the single vortex level, 32 whereas ensembles of vortices can be manipulated by nanopatterned current profiles, 33 temperature patterning, 34 and local magnetic fields. 35 The images presented demonstrate the invasiveness of widefield NV microscopy in this case.…”

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confidence: 99%

“…Moreover, uniform vortex configurations are recovered by heating the system globally above T c and cooling in the absence of laser (see SI, Figure S9). Recently, thermal gradients arising from focused laser beams have achieved patterning at the single vortex level, whereas ensembles of vortices can be manipulated by nanopatterned current profiles, temperature patterning, and local magnetic fields …”

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confidence: 99%

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Laser Modulation of Superconductivity in a Cryogenic Wide-field Nitrogen-Vacancy Microscope

et al. 2020

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Microscopic imaging based on nitrogen-vacancy (NV) centres in diamond, a tool increasingly used for room-temperature studies of condensed matter systems, has recently been extended to cryogenic conditions. However, it remains unclear whether the technique is viable for imaging temperaturesensitive phenomena below 10 K given the inherent laser illumination requirements, especially in a widefield configuration. Here we realise a widefield NV microscope with a field of view of 100 µm and a base temperature of 4 K, and use it to image Abrikosov vortices and transport currents in a superconducting Nb film. We observe the disappearance of vortices upon increase of laser power and their clustering about hot spots upon decrease, indicating that laser powers as low as 1 mW (4 orders of magnitude below the NV saturation) are sufficient to locally quench the superconductivity of the film (Tc = 9 K). This significant local heating is confirmed by resistance measurements, which reveal the presence of large temperature gradients (several K) across the film. We then investigate the effect of such gradients on transport currents, where the current path is seen to correlate with the temperature profile even in the fully superconducting phase. In addition to highlighting the role of temperature inhomogeneities in superconductivity phenomena, this work establishes that, under sufficiently low laser power conditions, widefield NV microscopy enables imaging over mesoscopic scales down to 4 K with a submicrometer spatial resolution, providing a new platform for real-space investigations of a range of systems from topological insulators to van der Waals ferromagnets.

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confidence: 99%

“…Moreover, uniform vortex configurations are recovered by heating the system globally above T c and cooling in the absence of laser (see SI, Figure S9). Recently, thermal gradients arising from focused laser beams have achieved patterning at the single vortex level, whereas ensembles of vortices can be manipulated by nanopatterned current profiles, temperature patterning, and local magnetic fields …”

mentioning

confidence: 99%

Laser Modulation of Superconductivity in a Cryogenic Wide-field Nitrogen-Vacancy Microscope

et al. 2020

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“…The behaviour of the superconducting state can change dramatically when the size of a superconductor becomes comparable to the characteristic lengths of superconductivity, the coherence length ξ and penetration depth λ [2][3][4][5], or the sample is exposed to excitations on submicron scale [6,7]. In the past two decades several theoretical studies focused on the confinement effects in superconductors patterned on a scale lower than one or both of these characteristic scales [8][9][10], but also, focused on the effect of symmetry on condensate confinement comparing mesoscopic disks, squares and triangles [11][12][13][14]. The theoretical macroscopic framework that built upon the definition of a superconducting wavefunction that characterizes the superconducting state, comes from the Ginzburg-Landau theory [2,3] which is used in this work.…”

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confidence: 99%

Effect of the Spatially-Varied Electron Mean Free Path on Vortex Matter in a Superconducting Pb Island Grown on Si (111)

González,

Durán

et al. 2023

Condensed Matter

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In this work we report theoretical calculations of a superconducting island in a strong vortex confinement regime. The obtained results reveal the evolution of the superconducting condensate with an applied magnetic field, depending on the spatial profile of the electron mean-free path in the sample. The results of this study provide an insight about the emergent superconducting properties under such conditions, using the Ginzburg-Landau numerical simulations where spatial variation of thickness of the island and the corresponding variation of the mean free path, omnipresent in similar structures of Pb grown on Si (111), are taken into account. These results offer a new route to tailor superconducting circuits by nanoengineered mean free path, using for example the controlled ion-bombardment on thin films, benefiting from the here shown impact of the spatially-varying mean free path on the vortex distribution, phase of superconducting order parameter, and the critical fields.

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Dynamic Properties of Vortex States in Mesoscopic Superconducting Strips with a Temporally Periodic Pinning Landscape

Lin

Xu²,

Cai

et al. 2019

J Low Temp Phys

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Vortex state in thermally-induced pinning patterns in superconducting film

Cited by 7 publications

References 48 publications

Laser Modulation of Superconductivity in a Cryogenic Wide-field Nitrogen-Vacancy Microscope

Laser Modulation of Superconductivity in a Cryogenic Wide-field Nitrogen-Vacancy Microscope

Effect of the Spatially-Varied Electron Mean Free Path on Vortex Matter in a Superconducting Pb Island Grown on Si (111)

Dynamic Properties of Vortex States in Mesoscopic Superconducting Strips with a Temporally Periodic Pinning Landscape

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