Ordered, Disordered, and Coexistent Stable Vortex Lattices in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NbSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Single Crystals

Pasquini, G.; Daroca, D. Pérez; Chiliotte, C.; Lozano, Gustavo; Bekeris, V.

doi:10.1103/physrevlett.100.247003

Cited by 49 publications

(72 citation statements)

References 31 publications

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“…amplitude independent) ac susceptibility, measured in sample A with the SANS setup, is also included. Below T p , the dissipative out-of-phase component χ ≈ 0, as expected in the linear Campbell regime [11,23].…”

Section: Estimation Of Vortex Displacementssupporting

confidence: 59%

Dynamic Reorganization of Vortex Matter into Partially Disordered Lattices

et al. 2015

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We report structural evidence of dynamic reorganization in vortex matter in clean NbSe2 by joint small angle neutron scattering and ac-susceptibility measurements. The application of oscillatory forces in a transitional region near the order-disorder transition results in robust bulk vortex lattice configurations with an intermediate degree of disorder. These dynamically-originated configurations correlate with intermediate pinning responses previously observed, resolving a long standing debate regarding the origin of such responses.PACS numbers: 74.25. Uv, 61.05.fg, 64.60.Cn In a wide variety of complex systems, competing interactions promote an order-disorder transition (ODT). Ordered phases are characterized by spatial correlations decaying weakly over distances larger than the relevant system scale, whereas disordered configurations are characterized by correlation lengths ζ of the order of the mean inter-particle distance a 0 . Configurations with intermediate degrees of disorder, strong enough to affect the system response, but still with ζ a 0 , have received attention recently [1]. Vortex matter in superconductors provides an ideal model system for the experimental study of the topic [2]: vortex-vortex interactions favoring an ordered vortex lattice (VL) compete with both thermal fluctuations and pinning interactions that tend to disorder the system.In very low-pinning superconductors, such as clean NbSe 2 single crystals, most of the vortex field-temperature phase diagram is properly described by an ordered dislocation-free Bragg Glass (BG) phase [3][4][5], which undergoes an ODT near the normal-superconductor transition [6][7][8]. In practice, when a superconductor is cooled from the normal state in an external magnetic field (fieldcooled/FC), energy barriers may trap the VL in highly disordered metastable configurations [8]. Even so, high transport current densities [9,10] or large oscillatory "shaking" magnetic fields [11,12] may anneal the VL into the ordered low-temperature BG. Once in the BG, as temperature or magnetic field is increased the VL softens and accommodates to the random pinning potential more efficiently. Eventually, vortex entanglement and the proliferation of VL dislocations increase the effective pinning, producing a sudden rise of the critical current J c known as the Peak Effect (PE) [7,8], which is the fingerprint of the ODT in vortex matter. While both the highpinning disordered phase and the low-pinning ordered phase, above and below the ODT, are widely accepted in the literature, intermediate responses have been ascribed to surface contamination and partial reordering by the probing transport current [9,10,13,14]. However, in the narrow transitional region adjacent to the PE, for which a multidomain phase has been theoretically proposed [15], non-invasive techniques have shown that pinning can be partially decreased or even increased by applying dc currents [16,17] To address this question, we performed an experiment in a clean NbSe 2 single crystal, combining small angle...

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Section: Estimation Of Vortex Displacementssupporting

confidence: 59%

Dynamic Reorganization of Vortex Matter into Partially Disordered Lattices

et al. 2015

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“…The appeal and advantage of superconducting systems is that the size and number of the particles can be tuned by changing the temperature and the magnetic field, respectively. In addition, the flexibility in the design and fabrication of artificial vortex traps in superconducting films has stimulated, during the past decade, an in-depth investigation of the interplay between pinning landscape and vortex pattern symmetry [16], influence of the pinning center's size and period [17][18][19][20], vortex rectification on a kagome-like array [21], competition between ordered and disordered defects [22][23][24], or pinning energy dispersion [25,26], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Mapping degenerate vortex states in a kagome lattice of elongated antidots via scanning Hall probe microscopy

Xue

et al. 2017

Phys. Rev. B

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We investigate the degeneracy of the superconducting vortex matter ground state by directly visualizing the vortex configurations in a kagome lattice of elongated antidots via scanning Hall probe microscopy. The observed vortex patterns, at specific applied magnetic fields, are in good agreement with the configurations obtained using time-dependent Ginzburg-Landau simulations. Both results indicate that the long-range interaction in this nanostructured superconductor is unable to lift the degeneracy between different vortex states and the pattern formation is mainly ruled by the nearest-neighbor interaction. This simplification makes it possible to identify a set of simple rules characterizing the vortex configurations. We demonstrate that these rules can explain both the observed vortex distributions and the magnetic-field-dependent degree of degeneracy.

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“…Although particular effort has been devoted to understand the dynamic behavior under dc drive, somewhat less attention has been paid to ac excitations [10][11][12][13][14][15][16]. Unfortunately, the extrapolation of the findings obtained under dc drive to predict the ac dynamics is not always straightforward.…”

Section: Introductionmentioning

confidence: 99%

Closer look at the low-frequency dynamics of vortex matter using scanning susceptibility microscopy

et al. 2014

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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 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.

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Ordered, Disordered, and Coexistent Stable Vortex Lattices inNbSe2Single Crystals

Cited by 49 publications

References 31 publications

Dynamic Reorganization of Vortex Matter into Partially Disordered Lattices

Dynamic Reorganization of Vortex Matter into Partially Disordered Lattices

Mapping degenerate vortex states in a kagome lattice of elongated antidots via scanning Hall probe microscopy

Closer look at the low-frequency dynamics of vortex matter using scanning susceptibility microscopy

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