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Kokkaliaris, S.; Groot, P.A.J. de; Gordeev, S.N.; Zhukov, A. A.; Gagnon, R.; Taillefer, Louis

doi:10.1103/physrevlett.82.5116

Cited by 104 publications

(131 citation statements)

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“…Kokkaliaris et al [34,35] [35], the above can be accomplished [36] if we examine the difference between the saturated value of the minor curve originating from a given M F C (H) value with the corresponding value of the envelope hysteresis curve and suitably normalize it to the width of the hysteresis loop, ∆M H . Figure 3(a) shows the field dependence of the differences (∆M suc ) in magnetization values (at a given H) on successive minor curves originating from M f or (H) in Ca 3 Rh 4 Sn 13 at 1.7 K, where both SMP anomaly and PE are present.…”

Section: Resultsmentioning

confidence: 99%

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

et al. 2006

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New experimental data are presented on the scan rate dependence of the magnetization hysteresis width ∆M (H) (∝ critical current density J c (H)) in isothermal M − H scans in a weakly pinned single crystal of Ca 3 Rh 4 Sn 13 , which displays second magnetization peak (SMP) anomaly as distinct from the peak effect (PE). We observe an interesting modulation in the field dependence of a parameter which purports to measure the dynamical annealing of the disordered bundles of vortices injected through the sample edges towards the destined equilibrium vortex state at a given H.These data, in conjunction with the earlier observations made while studying the thermomagnetic history dependence in J c (H) in the tracing of the minor hysteresis loops, imply that the partially disordered state heals towards the more ordered state between the peak field of the SMP anomaly and the onset field of the PE. The vortex phase diagram in the given crystal of Ca 3 Rh 4 Sn 13 has been updated in the context of the notion of the phase coexistence of the ordered and disordered regions between the onset field of the SMP anomaly and the spinodal line located just prior to the irreversibility line. A multi-critical point and a critical point in the (H, T ) region of the Bragg glass phase have been marked in this phase diagram and the observed behaviour is discussed in the light of recent data on multi-critical point in the vortex phase diagram in a single crystal of Nb.

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Section: Resultsmentioning

confidence: 99%

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

et al. 2006

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“…Below 30 K, strong pinning dominates, and no SMP is observable. At higher temperatures, the central peak gives way to collective pinning by atomic-sized point defects [8] and to the increase of the magnetic moment (SMP) at the onset field B OD [12,11,4,8], the temperature dependence of which is shown in Fig. 4d.…”

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confidence: 98%

“…Upon heating, the ordered vortex solid transits to the vortex liquid. However, an increase in vortex density at low temperature is also followed by a first order transition, to a second vortex solid (or glassy) phase with strongly modified dynamics [4,10,11,12,6]. The change in current-voltage characteristics that this entails leads to the so-called "second magnetization peak" (SMP) phenomenon in numerous type II superconductors.…”

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confidence: 99%

“…The change in current-voltage characteristics that this entails leads to the so-called "second magnetization peak" (SMP) phenomenon in numerous type II superconductors. The first order transition at the SMP onset field, B sp [12,11], has been interpreted either in terms of a structural change from a dislocation-free vortex "Bragg glass" to a plastically disordered phase [13,14,15], or in terms of the loss of vortex integrity along the field direction [6,16]. Thus, the understanding of the vortex phase diagram in disordered superconductors is incomplete at best, unsettled questions being the mechanism of the SMP transition, the link between vortex solid structure and dynamics, the nature of the vortex glass, and whether the high-field vortex solid is, in all cases, distinct from the liquid.…”

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confidence: 99%

“…Depending on the system (weakly disordered/or strong pinning) this structural transition drives the vortex lattice to a liquid phase with a melting transition or to a disordered solid phase with a glass transition respectively [19,18,15,1,5,11]. In conventional superconductors like in Nb single crystal and in NbSe 2 an anomalous phenomena is found in the vicinity of the peak effect where the critical current j c increases sharply below the upper critical field H c2 [17,11]. The vortex lattice studied with SANS and in situ magnetic susceptibility measurements in high purity Nb single crystal has revealed the history dependence of the structure in the peak effect regime via ZFC and FC procedures applied during the SANS measurements.…”

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confidence: 99%

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SANS study of vortex lattice structural transition in optimally doped (Ba_1−xK_x)Fe₂As₂

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et al. 2016

J. Phys.: Condens. Matter

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Abstract. Small-angle neutron scattering on high quality single crystalline Ba 1−x KxFe 2 As 2 reveals the transition from a low-field vortex solid phase with orientational order to a vortex polycrystal at high magnetic field. The vortex order-disorder transition is correlated with the second-peak feature in isothermal hysteresis loops, and is interpreted in terms of the generation of supplementary vortex solid dislocations. The sharp drop of the structure factor above the second peak field is explained by the dynamics of freezing of the vortex ensemble in the high field phase.

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Efficient Methods for Handling Long-Range Forces in Particle–Particle Simulations

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Journal of Computational Physics

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A number of problems arise when long-range forces, such as those governed by Bessel functions, are used in particle-particle simulations. If a simple cutoff for the interaction is used, the system may find an equilibrium configuration at zero temperature that is not a regular lattice yet has an energy lower than the theoretically predicted minimum for the physical system. We demonstrate two methods to overcome these problems in Monte Carlo and molecular dynamics simulations. The first uses a smoothed potential to truncate the interaction in a single unit cell: this is appropriate for phenomenological characterisations, but may be applied to any potential. The second is a new method for summing the unmodified potential in an infinitely tiled periodic system, which is in excess of 20,000 times faster than previous naive methods which add periodic images in shells of increasing radius: this is suitable for quantitative studies. Finally, we show that numerical experiments which do not handle the long-range force carefully may give misleading results: both of our proposed methods overcome these problems.

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Onset of Plasticity and Hardening of the Hysteretic Response in the Vortex System ofYBa2Cu3O7−

Cited by 104 publications

References 30 publications

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

SANS study of vortex lattice structural transition in optimally doped (Ba_1−xK_x)Fe₂As₂

Efficient Methods for Handling Long-Range Forces in Particle–Particle Simulations

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Onset of Plasticity and Hardening of the Hysteretic Response in the Vortex System ofYBa2Cu3O7−

Cited by 104 publications

References 30 publications

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

SANS study of vortex lattice structural transition in optimally doped (Ba1−xKx)Fe2As2

Efficient Methods for Handling Long-Range Forces in Particle–Particle Simulations

Contact Info

Product

Resources

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SANS study of vortex lattice structural transition in optimally doped (Ba_1−xK_x)Fe₂As₂