DEPARTAMENTO MATERIA CONDENSADA

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https://nuclea.cnea.gob.ar/handle/20.500.12553/5228

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Examinando DEPARTAMENTO MATERIA CONDENSADA por Autor "Anahory, Y."

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    Observation of a gel of quantum vortices in a superconductor at very low magnetic fields
    (American Physical Society, 2020-00-00) Llorens, J.B.; Embon, L.; Correa, A.; González, J.D.; Herrera, E.; Guillamón, I.; Luccas, R.F.; Azpeitia, J.; Mompeán, F.J.; García-Hernández, M.; Munuera, C.; Sánchez, J.A.; Fasano, Y.; Milošević, M.V.; Suderow, H.; Anahory, Y.; Gerencia Física. Departamento Materia Condensada. División Bajas Temperaturas
    A gel consists of a network of particles or molecules formed for example using the sol-gel process, by which a solution transforms into a porous solid. Particles or molecules in a gel are mainly organized on a scaffold that makes up a porous system. Quantized vortices in type-II superconductors mostly form spatially homogeneous ordered or amorphous solids. Here we present high-resolution imaging of the vortex lattice displaying dense vortex clusters separated by sparse or entirely vortex-free regions in β−Bi2Pd superconductor. We find that the intervortex distance diverges upon decreasing the magnetic field and that vortex lattice images follow a multifractal behavior. These properties, characteristic of gels, establish the presence of a novel vortex distribution, distinctly different from the well-studied disordered and glassy phases observed in high-temperature and conventional superconductors. The observed behavior is caused by a scaffold of one-dimensional structural defects with enhanced stress close to the defects. The vortex gel might often occur in type-II superconductors at low magnetic fields. Such vortex distributions should allow to considerably simplify control over vortex positions and manipulation of quantum vortex states.