| Records |
Author  |
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 |
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| 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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2399-3650 |
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BT @ pedrazp @ Aragón Sánchez2019 |
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843 |
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Bolecek, N.R.C.; Dolz, M.I.; Pastoriza, H.; Konczykowski, M.; van der Beek, C.J.; Kolton, A.B.; Fasano, Y. |
| Title |
Excess of topological defects induced by confinement in vortex nanocrystals |
Type |
Journal Article |
| Year |
2017 |
Publication |
Physical Review B |
Abbreviated Journal |
PRB |
| Volume |
96 |
Issue |
2 |
Pages |
024507 |
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We directly image individual vortex positions in nanocrystals in order to unveil the structural property that contributes to the depletion of the entropy jump entailed at the first-order transition. On reducing the nanocrystal size, the density of topological defects increases near the edges over a characteristic length. Within this “healing-length†distance from the sample edge, vortex rows tend to bend, while towards the center of the sample, the positional order of the vortex structure is what is expected for the Bragg-glass phase. This suggests that the healing length may be a key quantity to model confinement effects in the first-order transition of extremely layered vortex nanocrystals. |
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American Physical Society |
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BT @ hernan @ 10.1103/PhysRevB.96.024507 |
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762 |
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Cejas Bolecek, N.R.; Kolton, A.B.; Konczykowski, M.; Pastoriza, H.; Dominguez, D.; Fasano, Y. |
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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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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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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.93.054505 |
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738 |
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Dolz, M.I.; Kolton, A.B.; Pastoriza, H. |
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Direct determination of the collective pinning radius in the cuprate superconductor Bi2 Sr2 CaCu2 O8+ delta |
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Journal Article |
| Year |
2010 |
Publication |
Physical Review B |
Abbreviated Journal |
PRB |
| Volume |
81 |
Issue |
9 |
Pages |
092502 |
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We study the onset of the irreversible magnetic behavior of vortex matter in micron-sized Bi2Sr2CaCu2O8+δ single crystals by using silicon micro-oscillators. We find an irreversibility line appearing well below the thermodynamic Bragg-glass melting line at a magnetic field which increases both with increasing the sample radius and with decreasing the temperature, paradoxically implying the existence of a reversible vortex solid. We show that at this irreversibility line, the sample radius can be identified with the crossover length between the Larkin and the random-manifold regimes of the vortex-lattice transverse roughness. Our method thus allows to determine, as a function of temperature and applied magnetic field, the minimum size of a vortex system that can be collectively pinned, or the so-called three-dimensional weak collective pinning Larkin radius, in a direct way. |
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American Physical Society |
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BT @ hernan @ |
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587 |
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Pérez-Morelo, D.J.; Osquiguil, E.; Kolton, A.B.; Nieva, G.; Jung, I.W.; López, D.; Pastoriza, H. |
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Thermodynamic evidence for the Bose glass transition in twinned YBa2Cu3O7-δ crystals |
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Journal Article |
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2015 |
Publication |
Physical Review B |
Abbreviated Journal |
PRB |
| Volume |
92 |
Issue |
2 |
Pages |
020510 |
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We used a micromechanical torsional oscillator to measure the magnetic response of a twinned YBa2Cu3O7−δ single crystal disk near the Bose glass transition. We observe an anomaly in the temperature dependence of the magnetization consistent with the appearance of a magnetic shielding perpendicular to the correlated pinning of the twin boundaries. This effect is related to the thermodynamic transition from the vortex liquid phase to a Bose glass state. |
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American Physical Society |
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BT @ hernan @ 10.1103/PhysRevB.92.020510 |
Serial |
717 |
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Puig, J.; Aragón Sánchez, J.; Nieva, G.; Kolton, A.B.; Fasano, Y. |
| Title |
Hyperuniformity in Type-II Superconductors with Point and Planar Defects |
Type |
Journal Article |
| Year |
2023 |
Publication |
Journal of the Physical Society of Japan: Conference Proceedings |
Abbreviated Journal |
JPSJ: Conf. Proc. |
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38 |
Issue |
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Pages |
011051 |
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We use vortex matter in type-II superconductors as a playground to study how different types of disorder affect the long wavelength density fluctuations of the system. We find that irrespective of the vortex–vortex interaction, in the case of samples with weak and dense point defects the system presents the hidden order of hyperuniformity characterized by an algebraic suppression of density fluctuations when increasing the system size. We also reveal that, on the contrary, for samples with planar defects hyperuniformity is suppressed since density fluctuations have a tendency to unboundedness on increasing the system size. Although some of these results were known from previous works, this paper makes the fundamental discovery that the ability of planar disorder to suppress hyperuniformity grows on increasing the softness of the structure for more diluted systems. |
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BT @ pedrazp @ |
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896 |
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Puig, J.; Elías, F.; Aragón Sánchez, J.; Cortés Maldonado, R.; Rumi, G.; Nieva, G.; Pedrazzini, P.; Kolton, A.B.; Fasano, Y. |
| Title |
Anisotropic suppression of hyperuniformity of elastic systems in media with planar disorder |
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Journal Article |
| Year |
2022 |
Publication |
Communications Materials |
Abbreviated Journal |
Commun Mater |
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3 |
Issue |
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32 |
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Disordered hyperuniform materials with vanishing long-wavelength density fluctuations are attracting attention due to their unique physical properties. In these systems, the large-scale density fluctuations are strongly suppressed as in a perfect crystal, even though the system can be disordered like a liquid. Yet, hyperuniformity can be affected by the different types of quenched disorder unavoidably present in the host medium where constituents are nucleated. Here, we use vortex matter in superconductors as a model elastic system to study how planar correlated disorder impacts the otherwise hyperuniform structure nucleated in samples with weak point disorder. Planes of defects suppress hyperuniformity in an anisotropic fashion: while in the transverse direction to defects the long-wavelength density fluctuations are non-vanishing, in the longitudinal direction they are smaller and the system can eventually recover hyperuniformity for sufficiently thick samples. Our findings stress the need of considering the nature of disorder and thickness-dependent dimensional crossovers in the search for novel hyperuniform materials. |
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2662-4443 |
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BT @ pedrazp @ |
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884 |
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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 |
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Journal Article |
| Year |
2019 |
Publication |
Physical Review Research |
Abbreviated Journal |
Phys. Rev. Research |
| Volume |
1 |
Issue |
3 |
Pages |
033057 |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevResearch.1.033057 |
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851 |
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Sanchez, J.A.; Rumi, G.; Maldonado, R.C.; Bolecek, N.R.C.; Puig, J.; Pedrazzini, P.; Nieva, G.; Dolz, M.I.; Konczykowski, M.; van der Beek, C.J.; Kolton, A.B.; Fasano, Y. |
| Title |
Non-Gaussian tail in the force distribution: a hallmark of correlated disorder in the host media of elastic objects |
Type |
Journal Article |
| Year |
2020 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci. Rep. |
| Volume |
10 |
Issue |
1 |
Pages |
19452 |
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Inferring the nature of disorder in the media where elastic objects are nucleated is of crucial importance for many applications but remains a challenging basic-science problem. Here we propose a method to discern whether weak-point or strong-correlated disorder dominates based on characterizing the distribution of the interaction forces between objects mapped in large fields-of-view. We illustrate our proposal with the case-study system of vortex structures nucleated in type-II superconductors with different pinning landscapes. Interaction force distributions are computed from individual vortex positions imaged in thousands-vortices fields-of-view in a two-orders-of-magnitude-wide vortex-density range. Vortex structures nucleated in point-disordered media present Gaussian distributions of the interaction force components. In contrast, if the media have dilute and randomly-distributed correlated disorder, these distributions present non-Gaussian algebraically-decaying tails for large force magnitudes. We propose that detecting this deviation from the Gaussian behavior is a fingerprint of strong disorder, in our case originated from a dilute distribution of correlated pinning centers. |
| Address |
Centro Atomico Bariloche and Instituto Balseiro, CNEA, CONICET and Universidad Nacional de Cuyo, 8400, San Carlos de Bariloche, Argentina. yanina.fasano@cab.cnea.gov.ar |
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English |
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2045-2322 |
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BT @ pedrazp @ |
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865 |
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