Peak effect and anomalous flow behavior of a flux-line lattice

Bhattacharya, S.; Higgins, M. J.

doi:10.1103/physrevb.49.10005

Cited by 73 publications

(49 citation statements)

References 24 publications

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“…They also predicted that the depinning threshold increases at the order to disorder transition due to the softening of the lattice, which allows the particles to better adjust to the substrate. A similar mechanism could account for the peak effect observed in vortex matter in superconductors [49], in which the depinning threshold rises abruptly with increasing applied magnetic field.…”

Section: Crossover From Elastic To Quasi-elastic Depinningmentioning

confidence: 63%

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Piacente

Peeters

2005

Phys. Rev. B

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We studied the dynamics of a quasi-one-dimensional chain-like system of charged particles at low temperature, interacting through a screened Coulomb potential in the presence of a local constriction. The response of the system when an external electric field is applied was investigated. We performed Langevin molecular dynamics simulations for different values of the driving force and for different temperatures. We found that the friction together with the constriction pins the particles up to a critical value of the driving force. The system can depin elastically or quasi-elastically depending on the strength of the constriction. The elastic (quasi-elastic) depinning is characterized by a critical exponent β ∼ 0.66 (β ∼ 0.95). The dc conductivity is zero in the pinned regime, it has non-ohmic characteristics after the activation of the motion and then it is constant. Furthermore, the dependence of the conductivity with temperature and strength of the constriction was investigated in detail. We found interesting differences between the single and the multi-chain regimes as the temperature is increased.

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Section: Crossover From Elastic To Quasi-elastic Depinningmentioning

confidence: 63%

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Piacente

Peeters

2005

Phys. Rev. B

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“…For the layered dichalcogenide 2H-NbSe 2 (T c ≃ 7.2K), anisotropy, weak layering, small coherence lengths and large penetration depths enhance the effects of thermal fluctuations, yielding G i ∼ 10 −4 [36,37]. For the C15 Laves-phase superconductor CeRu 2 (T c ≃ 6.1K), G i ∼ 10 −5 [38], while for the ternary rare-earth stannides Ca 3 Rh 4 Sn 13 , (T c ≃ 8K) and Yb 3 Rh 4 Sn 13 , (T c ≃ 7.6K) , G i ∼ 10 −7 [39][40][41].…”

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Menon

2002

Phys. Rev. B

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A general phenomenology for phase behaviour in the mixed phase of type-II superconductors with weak point pinning disorder is outlined. We propose that the "Bragg glass" phase generically transforms via two separate thermodynamic phase transitions into a disordered liquid on increasing the temperature. The first transition is into a glassy phase, topologically disordered at the largest length scales; current evidence suggests that it lacks the longranged phase correlations expected of a "vortex glass". This phase has a significant degree of short-ranged translational order, unlike the disordered liquid, but no quasi-long range order, in contrast to the Bragg glass. This glassy phase, which we call a "multi-domain glass", is confined to a narrow sliver at intermediate fields, but broadens out both for much larger and much smaller field values. The multi-domain glass may be a "hexatic glass"; alternatively, its glassy properties may originate in the replica symmetry breaking envisaged in recent theories of the structural glass transition. Estimates for translational correlation lengths in the multi-domain glass indicate that * Email:menon@imsc.ernet.in 1 they can be far larger than the interline spacing for weak disorder, suggesting a plausible mechanism by which signals of a two-step transition can be obscured. Calculations of the Bragg glass-multi-domain glass and the multidomain glass-disordered liquid phase boundaries are presented and compared to experimental data. We argue that these proposals provide a unified picture of the available experimental data on both high-T c and low-T c materials, simulations and current theoretical understanding.

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“…For this material, G i ∼ 10 −4 [16]. For the C15 Laves-phase superconductor These systems all exhibit a sharp "Peak Effect" (PE) in the critical current density j c , a measure of the force required to depin the lattice [17,18].…”

Section: Introductionmentioning

confidence: 99%

Disordered type-II superconductors: a universal phase diagram for low-Tc systems

Banerjee

Grover

Higgins

et al. 2001

Physica C: Superconductivity

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A universal phase diagram for weakly pinned low-T c type-II superconductors is revisited and extended with new proposals. The low-temperature "Bragg glass" phase is argued to transform first into a disordered, glassy phase upon heating. This glassy phase, a continuation of the high-field equilibrium vortex glass phase, then melts at higher temperatures into a liquid. This proposal provides an explanation for the anomalies observed in the peak effect regime of 2H-NbSe 2 and several other low-T c materials which is independent of the * Corresponding Author, Email:menon@imsc.ernet.in † Corresponding Author, Email:shampa@mailhost.tifr.res.in 1 microscopic mechanisms of superconductivity in these systems.

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Peak effect and anomalous flow behavior of a flux-line lattice

Cited by 73 publications

References 24 publications

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Pinning and depinning of a classic quasi-one-dimensional Wigner crystal in the presence of a constriction

Phase behavior of type-II superconductors with quenched point pinning disorder: A phenomenological proposal

Disordered type-II superconductors: a universal phase diagram for low-Tc systems

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