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- W2018491119 abstract "Using scanning susceptibility microscopy, we shed light on the dynamics of individual superconducting vortices and examine the hypotheses of the phenomenological models traditionally used to explain the macroscopic ac electromagnetic properties of superconductors. The measurements, carried out on a ${text{2H-NbSe}}_{2}$ single crystal at relatively high temperature ($T=6.8$ K), show a linear amplitude dependence of the global ac susceptibility for excitation amplitudes between 0.3 and 2.6 Oe. We observe that the low amplitude response, typically attributed to the oscillation of vortices in a potential well defined by a single, relaxing, Labusch constant, actually corresponds to strongly nonuniform vortex shaking. This is particularly pronounced in the field-cooled disordered phase, which undergoes a dynamic reorganization above 0.8 Oe as evidenced by the healing of lattice defects and a more uniform oscillation of vortices. These observations are corroborated by molecular dynamics simulations when choosing the microscopic input parameters from the experiments. The theoretical simulations allow us to reconstruct the vortex trajectories, providing deeper insight into the thermally induced hopping dynamics and the vortex lattice reordering." @default.
- W2018491119 created "2016-06-24" @default.
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- W2018491119 date "2014-10-13" @default.
- W2018491119 modified "2023-09-26" @default.
- W2018491119 title "Closer look at the low-frequency dynamics of vortex matter using scanning susceptibility microscopy" @default.
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- W2018491119 doi "https://doi.org/10.1103/physrevb.90.134508" @default.
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