Decoupling and depinning of flux lattices in disordered layered superconductors

Horovitz, Baruch

doi:10.1103/physrevb.72.024519

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…The reason for the discrepancies comes mainly from the sensitivity of the curve on the disorder function [4] but also the neglection of the layerdness of BSCCO in our case could be one factor. Without taking into account dislocations, we expect a Josephson decoupling transition which is nearly temperature independent for low temperatures [35]. The melting line and the decoupling line lies on top of each other when taking into account dislocations leading to the first-order BG2-VG2, BG1-VG1, BG1-VL transition line.…”

Section: Observable Consequencesmentioning

confidence: 85%

Phase diagram of vortices in high-Tcsuperconductors with a melting line in the deepHc2region

Dietel

Kleinert

2009

Phys. Rev. B

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We use a simple elastic Hamiltonian for the vortex lattice in a weak impurity background which includes defects in the form of integer-valued fields to calculate the free energy of a vortex lattice in the deep Hc2 region. The phase diagram in this regime is obtained by applying the variational approach of Mézard and Parisi developed for random manifolds. We find a first-order line between the Bragg-glass and vortex-glass phase as a continuation of the melting line. In the liquid phase, we obtain an almost vertical third-order glass transition line near the critical temperature in the H − T plane. Furthermore, we find an almost vertical second-order phase transition line in the Bragg-glass as well as the vortex-glass phases which crosses the first-order Bragg-glass, vortex-glass transition line. We calculate the jump of the temperature derivate of the induction field across this second-order line as well as the entropy and magnetic field jumps across the first-order line.

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Section: Observable Consequencesmentioning

confidence: 85%

Phase diagram of vortices in high-Tcsuperconductors with a melting line in the deepHc2region

Dietel

Kleinert

2009

Phys. Rev. B

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“…As a result, random pinning sites not only can disorder the triangular lattices mentioned above (disordering of in-layer structures), but also may plastically twist or even tear vortex lines into 2D individual vortex segments, i.e. pancake vortices (disordering of inter-layer structures) [6][7][8][9]. Note that such a twisting effect may also exist in normal type-II superconductors when the external field is close to the upper critical field [10,11].…”

Section: Introductionmentioning

confidence: 99%

Equilibrium states of pancake vortices in layered superconductors: coupling of inter-layer ordering and in-layer ordering

Zhao

Zhou

et al. 2016

Supercond. Sci. Technol.

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We numerically study the static configurations of pancake vortices in layered superconductors. We analyze how disordering induced by random pinning centers competes with inter-layer ordering and in-layer ordering. In general, for inter-layer ordering, 3D states composed of coupled vortex lines are formed for strong inter-layer coupling strength and weak pinning strength. In contrast, 2D states composed of decoupled individual pancake vortices are formed for weak inter-layer coupling strength and strong pinning strength. For in-layer ordering, with increasing pinning forces, the in-layer structure evolves from crystals to Bragg glasses (BGs), vortex glasses (VGs), and liquid-like structures. Changing the vortex density, an initially fast disordering, then slow ordering procedure is found for both in-layer and inter-layer ordering, which is a possible clue to second peak effect (SPE). The reason behind this non-monotonic behavior is discussed. Our results are summarized in a phase diagram in the plane of ‘inter-layer coupling strength sm versus pinning strength fp.

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“…Thermal fluctuations and random quenched disorder both play a crucial role in the formation of the magnetic field-temperature (H -T ) phase diagram of high-temperature superconductors (HTSCs). Many experimental [1][2][3][4][5][6] and theoretical [7][8][9][10][11][12][13][14] works have been devoted to the study of the properties of the transition lines between the different phases of vortex matter in these complex systems.…”

Section: Introductionmentioning

confidence: 99%

The first-order vortex transition line in three-dimensional anisotropic superconductors in tilted magnetic fields

Leyton¹,

Calero²,

Silva³

2008

Supercond. Sci. Technol.

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The vortex lattice in high-temperature superconductors is affected by thermal fluctuations and quenched disorder, leading to disordered phases, such as vortex liquid and glass, through a first-order phase transition. We use a transformation proposed by Calero, in order to obtain the angular generalization of the first-order melting line of the vortex lattice in a three-dimensional anisotropic superconductor, such as YBaCuO, under an external magnetic field with arbitrary direction with respect to the anisotropy axis. The calculations are performed in the framework of the Ginzburg-Landau theory in the lowest Landau level approximation. The competition between thermal fluctuations and disorder is described following the same method as that developed by Li and Rosenstein.

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Decoupling and depinning of flux lattices in disordered layered superconductors

Cited by 6 publications

References 56 publications

Phase diagram of vortices in high-Tcsuperconductors with a melting line in the deepHc2region

Phase diagram of vortices in high-Tcsuperconductors with a melting line in the deepHc2region

Equilibrium states of pancake vortices in layered superconductors: coupling of inter-layer ordering and in-layer ordering

The first-order vortex transition line in three-dimensional anisotropic superconductors in tilted magnetic fields

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