Experimental realization of smectic phase in vortex matter induced by symmetric potentials arranged in two-fold symmetry arrays

Valle, Javier del; Gómez, A.; González, E. M.; Osorio, Manuel; Gálvez, F.; Granados, Daniel; Vicent, J. L.

doi:10.1088/1367-2630/17/9/093022

Cited by 5 publications

(7 citation statements)

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“…In our case, we study commensurability effects when the pinning potential local order is not conserved. Vortex matter is a very peculiar state of matter and it is well known that vortex lattice moving on ordered [40] as well as random pinning potentials [41] can trigger a vortex smectic phase. Surprisingly, perfect regular arrays can induce both vortex commensurability effects and smectic phase [40].…”

Section: Resultsmentioning

confidence: 99%

“…Vortex matter is a very peculiar state of matter and it is well known that vortex lattice moving on ordered [40] as well as random pinning potentials [41] can trigger a vortex smectic phase. Surprisingly, perfect regular arrays can induce both vortex commensurability effects and smectic phase [40]. So, arrays which mimic a smectic crystal seem to be a correct choice to study what happens if we disturb the local order in such a way that we uphold the order periodicity in one direction and we break the periodicity in the perpendicular direction.…”

Section: Resultsmentioning

confidence: 99%

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Different approaches to generate matching effects using arrays in contact with superconducting films.

Valle¹,

Gómez²,

Luis-Hita³

et al. 2016

Supercond. Sci. Technol.

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Superconducting films in contact with non-superconducting regular arrays can exhibit commensurability effects between the vortex lattice and the unit cell of the pinning array. These matching effects yield a slowdown of the vortex flow and the corresponding dissipation decrease. The superconducting samples are Nb films grown on Si substrates. We have studied these matching effects with the array on top, embedded or threading the Nb superconducting films and using different materials (Si, Cu, Ni, Py dots and dots fabricated with Co/Pd multilayers). These hybrids allow studying the contribution of different pinning potentials to the matching effects. The main findings are: i) Periodic roughness induced in the superconducting film is enough to generate resistivity minima; ii) A minor effect is achieved by magnetic pinning from periodic magnetic field potentials obtained by dots with out of plane magnetization grown on top of the superconducting film, iii) In the case of array of magnetic dots embedded in the films vortex flow probes the magnetic state; i.e. magnetoresistance measurements detect the magnetic state of very small nanomagnets. In addition, we have studied the role played by the local order in the commensurability effects. This was attained using an array that mimics a smectic crystal. We have found that preserving the local order is crucial. If the local order is not retained the magnetoresistance minima vanish.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Different approaches to generate matching effects using arrays in contact with superconducting films.

Valle¹,

Gómez²,

Luis-Hita³

et al. 2016

Supercond. Sci. Technol.

Self Cite

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“…In experiments, it would be possible to use a crossed driving geometry that permits the application of mutually perpendicular driving currents. There are also a variety of techniques that can be used to add a well defined number of pinning sites to the system in random or periodic arrangements [61][62][63] , permitting the ratio of the number of vortices to the number of pinning sites to be tuned by varying the applied magnetic field. It would also be interesting to test whether periodic pinning arrays produce extended regions of fragile states or reduce the occurrence of fragile states.…”

Section: Discussionmentioning

confidence: 99%

Jamming, fragility and pinning phenomena in superconducting vortex systems

Reichhardt

2020

Sci Rep

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“…For example, in the case of type-II superconductors with isotropic repulsion, the vortices form a triangular lattice [3]. There are, however, many examples of particle-like systems that have twofold anisotropic interactions, including colloidal particles in tilted magnetic fields [27,28], dusty plasmas [29], electron liquid crystal states [30][31][32], skyrmions [33][34][35], and superconducting vortices [36][37][38][39][40][41][42][43]. Anisotropic vortex-vortex interactions can arise from anisotropy in the material or nematicity in the substrate, or it can be induced by a tilted field in uniaxial superconductors.…”

Section: Introductionmentioning

confidence: 99%

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

2022

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We examine the dynamics of superconducting vortices with two-fold anisotropic interaction potentials driven over random pinning, and compare the behavior under drives applied along the hard and the soft anisotropy directions. As the driving force increases, the number of topological defects reaches a maximum near the depinning threshold, and then decreases as the vortices form one-dimensional chains. This coincides with a transition from a pinned nematic to a moving smectic aligned with the soft anisotropy direction. The system is generally more ordered when the drive is applied along the soft direction of the anisotropy. For driving along the hard direction, there is a critical value of the twofold anisotropy above which the system remains aligned with the soft direction. Hysteretic behavior appears upon cycling the driving force, with one-dimensional vortex chains persisting during the decreasing leg below the threshold for chain formation for increasing drive. More anisotropic systems have a greater amount of structural disorder in the moving state. For lower anisotropy, the system forms a moving smectic-A state, while at higher anisotropy, a moving nematic state appears instead.

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Experimental realization of smectic phase in vortex matter induced by symmetric potentials arranged in two-fold symmetry arrays

Cited by 5 publications

References 50 publications

Different approaches to generate matching effects using arrays in contact with superconducting films.

Different approaches to generate matching effects using arrays in contact with superconducting films.

Jamming, fragility and pinning phenomena in superconducting vortex systems

Driven superconducting vortex dynamics in systems with twofold anisotropy in the presence of pinning

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