Imaging the vortex-lattice melting process in the presence of disorder

Soibel, Alexander; Zeldov, E.; Rappaport, Michael; Myasoedov, Y.; Tamegai, T.; Ooi, S.; Kończykowski, M.; Geshkenbeǐn, V. B.

doi:10.1038/35018532

Cited by 224 publications

(200 citation statements)

References 13 publications

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“…These experiments reveal a remarkable and complex coexistence of fluid and solid domains in the larger crystals with the properties that We point out that from related studies on 2H-NbSe 2 , it is known that the intermediate state on field cooling is relatively highly disordered, with short-ranged correlations resembling those in the liquid. By analogy, one would expect similar disordered states to be seen in the BSCCO case on field cooling, precisely as seen [52].…”

Section: Bsccomentioning

confidence: 92%

“…al. have reexamined this issue [52]. These experiments see a global rounding of the transition as a consequence of quenched disorder, argued by these authors to be due to a broad distribution of local melting temperatures at scales down to the mesoscopic scale [52].…”

Section: Bsccomentioning

confidence: 99%

“…Even if R a /a ∼ 30, the corresponding induction jump ∆B ∼ ∆M is of order 10 −3 M 0 or within noise levels in a typical experiment [15,52].…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

“…have reexamined this issue [52]. These experiments see a global rounding of the transition as a consequence of quenched disorder, argued by these authors to be due to a broad distribution of local melting temperatures at scales down to the mesoscopic scale [52]. These experiments reveal a remarkable and complex coexistence of fluid and solid domains in the larger crystals with the properties that We point out that from related studies on 2H-NbSe 2 , it is known that the intermediate state on field cooling is relatively highly disordered, with short-ranged correlations resembling those in the liquid.…”

Section: Bsccomentioning

confidence: 99%

“…The multi-domain character of this phase is argued to manifest itself in the fact that the transition between BrG and DL phases can occur via several intermediate stages, corresponding to the melting of different domains as a consequence of disorder-induced inhomogeneities in the melting temperature [52]. This can result in large noise signals [36] associated with a small number of fluctuators [36,53], intermediate structure in the ac susceptibility as a function of T [31,34], a stepwise expulsion of vortices [54], strong thermal instabilities [36,55] and a host of other phenomena specific to this phase [35], all features of the experimental data, which are hard to rationalize in other pictures.…”

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

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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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Section: Bsccomentioning

confidence: 92%

Section: Bsccomentioning

confidence: 99%

“…Even if R a /a ∼ 30, the corresponding induction jump ∆B ∼ ∆M is of order 10 −3 M 0 or within noise levels in a typical experiment [15,52].…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

Section: Bsccomentioning

confidence: 99%

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

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

Menon

2002

Phys. Rev. B

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Numerical Simulations of Double Bitter Decoration Experiments

Laguna

Cornaglia

Balseiro

2002

phys. stat. sol. (b)

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We simulate a magnetic double decoration experiment, modeling the problem as a 2D vortex system in the presence of two types of pinning forces. One represents the Bitter pinning introduced by a previous magnetic decoration, and the other is the dense point disorder. We study the freezing of the vortex lattice and analyze the topological order of our double decoration patterns.Introduction Vortex lattices represent an ideal laboratory to analyze thermodynamic and dynamical properties and phase transitions [1]. This is due to the possibility to control the interaction between vortices and to study how they couple with intrinsic and artificial potentials [2]. Many theoretical studies and simulations involve periodic and commensurate pinning effects [3][4][5]. Also, several techniques have recently been implemented to artificially create pinning centers [6,7]. The magnetic decoration technique [7] allows to study the behavior of the system in the presence of a quasiperiodic pinning structure. A magnetic decoration of vortices with iron particles acts as a superficial pinning for the second experiment, and several regimes in the pinning behavior are observed. Perfect matching between two replicas induced by the weak interaction between them indicates a collective response induced by a small perturbation. In this work we study the dynamics of nucleation and propagation of the vortex structure. We also explore the different regimes of intrinsic pinning force and Bitter pinning, presenting additional results which support the ones obtained previously [8], and analyze the behavior of the vortex lattice when the vortex density of the second decoration is slightly different from the first one.

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A General Approach to First Order Phase Transitions and the Anomalous Behavior of Coexisting Phases in the Magnetic Case

Gama

Campos

Coelho

et al. 2009

Adv Funct Materials

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First order phase transitions for materials with exotic properties are usually believed to happen at fixed values of the intensive parameters (such as pressure, temperature, etc.) characterizing their properties. It is also considered that the extensive properties of the phases (such as entropy, volume, etc.) have discontinuities at the transition point, but that for each phase the intensive parameters remain constant during the transition. These features are a hallmark for systems described by two thermodynamic degrees of freedom. In this work it is shown that first order phase transitions must be understood in the broader framework of thermodynamic systems described by three or more degrees of freedom. This means that the transitions occur along intervals of the intensive parameters, that the properties of the phases coexisting during the transition may show peculiar behaviors characteristic of each system, and that a generalized Clausius–Clapeyron equation must be obeyed. These features for the magnetic case are confirmed, and it is shown that experimental calorimetric data agree well with the magnetic Clausius–Clapeyron equation for MnAs. An estimate for the point in the temperature‐field plane where the first order magnetic transition turns to a second order one is obtained (the critical parameters) for MnAs and Gd5Ge2Si2 compounds. Anomalous behavior of the volumes of the coexisting phases during the magnetic first order transition is measured, and it is shown that the anomalies for the individual phases are hidden in the behavior of the global properties as the volume.

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Imaging the vortex-lattice melting process in the presence of disorder

Cited by 224 publications

References 13 publications

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

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

Numerical Simulations of Double Bitter Decoration Experiments

A General Approach to First Order Phase Transitions and the Anomalous Behavior of Coexisting Phases in the Magnetic Case

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