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Author  |
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. |
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Observation of a gel of quantum vortices in a superconductor at very low magnetic fields |
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Journal Article |
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Year |
2020 |
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Physical Review Research |
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Phys. Rev. Research |
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2 |
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013329 |
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Abstract |
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
−
Bi
2
Pd
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. |
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2643-1564 |
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Call Number |
BT @ pedrazp @ |
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867 |
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