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Author (up) Aragón Sánchez, J.; Cortés Maldonado, R.; Cejas Bolecek, N.R.; Rumi, G.; Pedrazzini, P.; Dolz, M.I.; Nieva, G.; Beek, C.J. van der; Konczykowski, M.; Dewhurst, C.D.; Cubitt, R.; Kolton, A.B.; Pautrat, A.; Fasano, Y.
Title Unveiling the vortex glass phase in the surface and volume of a type-II superconductor Type Journal Article
Year 2019 Publication Communications Physics Abbreviated Journal Commun. Phys.
Volume 2 Issue 1 Pages 143
Keywords
Abstract Order-disorder transitions between glassy phases are common in nature and yet a comprehensive survey on the entailed structural changes is challenging since the constituents are in the micro-scale. Vortex matter in type-II superconductors is a model system where some of these experimental challenges can be tackled. Samples with point disorder present a glassy transition on increasing the density of vortices. A glassy yet quasi-crystalline phase, the Bragg glass, nucleates at low densities. The vortex glass stable at high densities is expected to be disordered, however its detailed structural properties remained experimentally elusive. Here we show that the vortex glass has large crystallites with in-plane positional displacements growing algebraically and short-range orientational order. Furthermore, the vortex glass has a finite and almost constant correlation length along the direction of vortices, in sharp contrast with strong entanglement. These results are important for the understanding of disorder-driven phase transitions in glassy condensed matter.
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ISSN 2399-3650 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Aragón Sánchez2019 Serial 843
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Author (up) Cejas Bolecek, N.R.; Kolton, A.B.; Konczykowski, M.; Pastoriza, H.; Dominguez, D.; Fasano, Y.
Title Vortex matter freezing in Bi2Sr2CaCu28 samples with a very dense distribution of columnar defects Type Journal Article
Year 2016 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 93 Issue 5 Pages 054505
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Abstract We show that the dynamical freezing of vortex structures nucleated at diluted densities in Bi2Sr2CaCu2O8 samples with a dense distribution of columnar defects, B∼10−2BΦ with BΦ=5kG, results in configurations with liquidlike correlations. We propose a freezing model considering a relaxation dynamics dominated by double-kink excitations driven by the local stresses obtained directly from experimental images. With this model we estimate the relaxation barrier and the freezing temperature. We argue that the low-field frozen vortex structures nucleated in a dense distribution of columnar defects thus correspond to an out-of-equilibrium nonentangled liquid with strongly reduced mobility rather than to a snapshot of a metastable state with divergent activation barriers as, for instance, expected for the Bose-glass phase at equilibrium.
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.93.054505 Serial 738
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Author (up) Cejas Bolecek, N.R.; Dolz, M.I.; Kolton, A.; Pastoriza, H.; Beek, C.Jvander; Konczykowski, M.; Menghini, M.; Nieva, G.; Fasano, Y.
Title Geometrical Confinement Effects in Layered Mesoscopic Vortex Matter Type Journal Article
Year 2015 Publication Journal of Low Temperature Physics Abbreviated Journal J. Low Temp. Phys.
Volume 179 Issue 1-2 Pages 35-41
Keywords Vortex matter; Mesoscopic physics; Layered superconductors
Abstract We study the geometrical confinement effect in Bi 2 Sr 2 CaCu 2 O 8+δ mesoscopic vortex matter with edge-to-surface ratio of 7–12 %. Samples have in-plane square and circular edges, 30 μ m widths, and ∼ 2 μ m thickness. Direct vortex imaging reveals the compact planes of the structure align with the sample edge by introducing topological defects. The defect density is larger for circular than for square edges. Molecular dynamics simulations suggest that this density is not an out-of-equilibrium property but rather determined by the geometrical confinement.
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Publisher Springer US Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-2291 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 711
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Author (up) DemirdiÅŸ, S.; van der Beek, C.J.; Fasano, Y.; Cejas Bolecek, N.R.; Pastoriza, H.; Colson, D.; Rullier-Albenque, F.
Title Strong pinning and vortex energy distributions in single-crystalline Ba(Fe{1−x}Co{x}){2}As{2} Type Journal Article
Year 2011 Publication Physical Review B Abbreviated Journal PRB
Volume 84 Issue 9 Pages 094517
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Abstract The interrelation between heterogeneity and flux pinning is studied in Ba(Fe1−xCox )2As2 single crystals with widely varying Co content x.Magnetic Bitter decoration of the superconducting vortex ensemble in crystals with x = 0.075 and x = 0.1 reveals highly disordered vortex structures. The width of the Meissner belt bserved at the edges of the crystals, and above the surface steps formed by leaving, as well as the width of the intervortex distance distribution, indicate that the observed vortex ensemble is established at a temperature just below the critical temperature Tc. The vortex interaction energy and pinning force distributions extracted from the images strongly suggest that the vortex lattice disorder is attributable to strong pinning due to spatial fluctuations of Tc and of the superfluid density. Correlating the results with the critical current density ields a typical length scale of the relevant disorder of 40–60 nm.
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ hernan @ Serial 605
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Author (up) Facio, J.I.; Betancourth, D.; Cejas Bolecek, N.R.; Jorge, G.A.; Pedrazzini, P.; Correa, V.F.; Cornaglia, P.S.; Vildosola, V.; García D.J.
Title Lattice specific heat for the RMIn5 (R=Gd, La,Y; M=Co, Rh) compounds: Non-magnetic contribution subtraction Type Journal Article
Year 2016 Publication Journal of Magnetism and Magnetic Materials Abbreviated Journal J. Magn. Magn. Mater.
Volume 407 Issue Pages 406-4011
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Call Number BT @ victor.correa @ Serial 730
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Author (up) Puig, J.; Cejas Bolecek, N.R.; Aragón Sánchez, J.; Dolz, M.I.; Konczykowski, M.; Fasano, Y.
Title Bridge in micron-sized Bi2Sr2CaCu2O8 sample act as converging lens for vortices Type Journal Article
Year 2021 Publication Physica C: Superconductivity and its Applications Abbreviated Journal Physica C
Volume 590 Issue Pages 1353948
Keywords Vortex matterMesoscopic samplesStructural properties
Abstract We report on direct imaging of vortex matter nucleated in micron-sized BiSrCaCuO superconducting samples that incidentally present a bridge structure. We find that when nucleating vortices in a field-cooling condition the deck of the bridge acts as a converging lens for vortices. By means of Bitter decoration images allowing us to quantify the enhancement of vortex-vortex interaction energy per unit length in the deck of the bridge, we are able to estimate that the deck is thinner than m. We show that the structural properties of vortex matter nucleated in micron-sized thin samples are not significantly affected by sample-thickness variations of the order of half a micron, an important information for type-II superconductors-based mesoscopic technological devices.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4534 ISBN Medium
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Notes Approved no
Call Number BT @ pedrazp @ Serial 878
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Author (up) Rumi, G.; Aragón Sánchez, J.; Elías, F.; Cortés Maldonado, R.; Puig, J.; Cejas Bolecek, N.R.; Nieva, G.; Konczykowski, M.; Fasano, Y.; Kolton, A.B.
Title Hyperuniform vortex patterns at the surface of type-II superconductors Type Journal Article
Year 2019 Publication Physical Review Research Abbreviated Journal Phys. Rev. Research
Volume 1 Issue 3 Pages 033057
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Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevResearch.1.033057 Serial 851
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Author (up) van der Beek, C.J.; Demirdis,S.; Konczykowski, M.; Fasano, Y.; Cejas Bolecek, N.R.; Pastoriza, H.; Colson, D.; Rullier-Albenque, F.
Title Vortex pinning : a probe for nanoscale disorder in iron-based superconductors Type Journal Article
Year 2012 Publication Physica B Abbreviated Journal Phys B
Volume 407 Issue 11 Pages 1746-1749
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Notes Approved no
Call Number BT @ yanina.fasano @ Serial 643
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