Series of maxima in the field dependent magnetic moment of layered superconductors

Brongersma, Sywert; Groot, de H.L.F.; Griessen, R.; Ivlev, B. I.; Koeman, N.J.; Verweij, E.

doi:10.1103/physrevlett.71.2319

Cited by 103 publications

(77 citation statements)

References 14 publications

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“…For example, for Yukawa particles the direct 2 − 3-transition was observed in dusty plasma clusters 24 with increasing linear density. In addition, a SOT has been predicted theoretically for an Abrikosovvortex arrangement in a superconducting slab for low temperatures [25][26][27][28][29] , for Pearl vortices 30 , and also for binary mixtures of repulsive particles 31 , in particular, when the ratio between charges of both species was around 1/5.…”

Section: Introductionmentioning

confidence: 99%

Generic ordering of structural transitions in quasi-one-dimensional Wigner crystals

Galván-Moya

Peeters

2014

Phys. Rev. B

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We investigate the dependence of the structural phase transitions in an infinite quasi-onedimensional system of repulsively interacting particles on the profile of the confining channel. Three different functional expressions for the confinement potential related to real experimental systems are used that can be tuned continuously from a parabolic to a hard-wall potential in order to find a thorough understanding of the ordering of the chain-like structure transitions. We resolve the longstanding issue why the most theories predicted a 1-2-4-3-4 sequence of chain configurations with increasing density, while some experiments found the 1-2-3-4 sequence.

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Section: Introductionmentioning

confidence: 99%

Generic ordering of structural transitions in quasi-one-dimensional Wigner crystals

Galván-Moya

Peeters

2014

Phys. Rev. B

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“…Such a "core explosion" transition of a vortex into a phase slip center can occur in thin films at temperatures T > T v because the coherence length ξ(T ) = ξ 0 (1 − T /T c ) −1/2 diverges at the critical temperature T c . The behavior of mesoscopic vortex structures in confined geometries has attracted much attention both experimentally 3 and theoretically 4,5 . Thermal fluctuations can radically change the behavior of vortices in thin films in a parallel field B.…”

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confidence: 99%

Thermally activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films

2012

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We report magneto-transport measurements on a superconducting molybdenum-germanium (MoGe) film of thickness d=50 nm in parallel magnetic fields and show evidence of a transition from a Meissner state to a resistive state of spontaneous perpendicular vortices generated by thermal fluctuations above a certain temperature T > Tv (B). Here Tv appears to match the vortex core explosion condition d ≈ 4.4ξ(Tv), where ξ is the coherence length. For T > Tv, we observed that a nonlinear current-voltage (IV ) response (Ohmic at low currents and the power law V ∝ I β at higher I) is exponentially dependent on B 2 . We propose a model in which the resistive state at T > Tv is due to thermally-activated hopping of spontaneous perpendicular vortices tuned by the pairbreaking effect of the parallel B.

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“…Note that as the film thickness increases the matching peaks become less evident in the magnetization loops, that is, the film gradually crosses over from mesoscopic to macroscopic behavior. The matching effect of vortex chains in thin slabs (W < λ) has been studied in the framework of thermodynamic equilibrium [13]. Our approach assumes that a vortex nucleates at the surfaces, i.e., for fields just above H c1 it has to overcome a strong energy barrier in order to find the global minimum at the equatorial plane of the film.…”

Section: Vortex Chain States In Mesoscopic Filmsmentioning

confidence: 99%

Vortex configurations and metastability in mesoscopic superconductors

Silva

Cabral

Aguiar

2004

Physica C: Superconductivity

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The vortex dynamics in mesoscopic superconducting cylinders with rectangular cross section under an axially applied magnetic field is investigated in the multivortex London regime. The rectangles considered range from a square up to an infinite slab. The flux distribution and total flux carried by a vortex placed in an arbitrary position of the sample is calculated analytically by assuming Clem's solution for the vortex core. The Bean-Livingston energy barrier is also analytically calculated in this framework. A Langevin algorithm simulates the flux penetration and dynamical evolution of the vortices as the external field is slowly cycled. The simulated magnetization process is governed by metastable states. The magnetization curves are hysteretic, with paramagnetic response in part of the downward branch, and present a series of peaks corresponding to the entry or expulsion of a single vortex. For elongated rectangles, the vortices arrange themselves into parallel vortex chains and an additional modulation of the magnetization, corresponding to creation or destruction of a vortex chain, comes out.

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Series of maxima in the field dependent magnetic moment of layered superconductors

Cited by 103 publications

References 14 publications

Generic ordering of structural transitions in quasi-one-dimensional Wigner crystals

Generic ordering of structural transitions in quasi-one-dimensional Wigner crystals

Thermally activated dynamics of spontaneous perpendicular vortices tuned by parallel magnetic fields in thin superconducting films

Vortex configurations and metastability in mesoscopic superconductors

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