Observation of separate vortex-melting and vortex-glass transitions in defect-enhanced<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></m

Worthington, T. K.; Fisher, Matthew P. A.; Huse, David A.; Toner, John; Marwick, A. D.; Zabel, T.H.; Feild, C.; Holtzberg, F.

doi:10.1103/physrevb.46.11854

Cited by 129 publications

(80 citation statements)

References 20 publications

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“…1. Within this physical picture, the existence of the so-called slush phase 10 can be naturally explained. Recent experiments 11,12,13,14,15 for YBaCuO seem to support this scenario.…”

Section: −2 Amentioning

confidence: 99%

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Mikitik

Brandt

2003

Phys. Rev. B

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The vortex-lattice melting line in three-dimensional type-II superconductors with pinning is derived by equating the free energies of the vortex system in the solid and liquid phases. We account for the elastic and pinning energies and the entropy change that originates from the disappearance of the phonon shear modes in the liquid. The pinning is assumed to be caused by point defects and to be not too strong so that the melting line lies inside the so-called bundle-pinning region. We show that the derived equation for the melting line is equivalent to some Lindemann criterion, which however differs from that used previously. Estimating the effect of pinning on the entropy jump at melting, we find the upper critical point of the melting line from the condition that this jump vanishes. We also consider the H-T phase diagrams of type-II superconductors for different strengths and types of pinning and analyze the two recently discussed scenarios how the melting line and the order-disorder line merge.

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“…1. Within this physical picture, the existence of the so-called slush phase 10 can be naturally explained. Recent experiments 11,12,13,14,15 for YBaCuO seem to support this scenario.…”

Section: −2 Amentioning

confidence: 99%

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Mikitik

Brandt

2003

Phys. Rev. B

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“…Also, extensions of the TAFF theory were constructed [31]. Finally, a Vortex Slush picture has been proposed, viewing the glass of vortices as a viscous liquid, driven by the remnants of the first order melting transition [32].…”

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confidence: 99%

Vortices Freeze like Window Glass: The Vortex Molasses Scenario

Reichhardt

A²,

2000

Phys. Rev. Lett.

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We overview several recent experimental and numerical observations, which are at odds with the Vortex Glass theory of the freezing of disordered vortex matter. To reinvestigate the issue, we performed numerical simulations of the overdamped London -Langevin model, and use finite size scaling to analyze the data. Upon approaching the transition the initial Vortex Glass type criticality is arrested at some crossover temperature. Below this temperature the timescales continue growing very quickly, consistent with the Vogel-Fulcher form, while the spatial correlation length ξ stops exhibiting any observable divergence. We call this mode of freezing the Vortex Molasses scenario.PACS numbers: 74.60.Ge, 74.25.DwThe influence of disorder on vortex matter is one of the most paradigmatic problems. The vortex lattice, formed in clean systems, is inherently unstable towards a less ordered state even for infinitesimally small disorder [1]. At small magnetic fields, or equivalently, at weak disorder, a dislocation free phase is emerges, which thus retains a topological order. Small angle neutron scattering [2], and Bitter decoration experiments [3] seem to support this picture. The theoretical foundation for such a Bragg Glass was provided by scaling arguments [4], and variational calculations [5]. Its cornerstone is the logarithmic behaviour of vortex correlations at large distances. Numerical simulations also reported a strongly suppressed dislocation density [6], and confirmed the logarithmic behaviour of correlations [7] below a critical field strength. It is noteworthy, however, that the largest scale imaging studies [8], did not find evidence for logarithmic correlations, thus the details of the dislocation free regime are still subject to discussion.We also understand the influence of increasing fields, or disorder. The key phenomenon here is the appearance of dislocation loops, accompanied by the entanglement of vortices [9,10]. Experimental support for this idea is the sharp enhancement of the critical current from magnetization measurements [11][12][13][14], the rapid destruction of the Bragg peaks in neutron scattering [2], and the pronounced dips in the electric field -current density, or E-J curves [15]. Numerical studies found evidence for dislocation loops destroying a quasi-ordered state in frustrated XY models [16], in Lawrence-Doniach representations [6], and in realistic London-Langevin approaches [7].The nature of the high field phase is still very much in debate. The thermally assisted flux flow (TAFF) picture predicts that vortices move in bundles, and overcome barriers via thermal excitations. This destroys superconductivity because the linear resistivity assumes a finite value, governed by an activated temperature dependence R(T ) ∼ R 0 exp(−U/T ) [17]. An influential alternative was put forward in the form of the Vortex Glass (VG) theory [18,19]. The proposed Vortex Glass phase is distinguished by an unbounded distribution of barrier heights. This results in the vanishing of the linear resistivity, th...

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“…Vortex-lattice melting transition is believed to be responsible for the appearance of reversibility [15,16,18,19]. The explicit angular dependence of T m was derived by Blatter et al [5,49] using their scaling approach:…”

Section: A Unirradiated Ybco Filmmentioning

confidence: 99%

“…Several models, like thermally activated depinning [2,3,6,13,14], vortex-lattice melting [15][16][17][18][19][20][21] and a transition from vortex glass to vortex fluid [23][24][25], were proposed to identify the origin of the IRL in HTS. Also, attention was given to the possibility of pinning in the vortex-liquid phase [5,10,11,26] and to different dissipation mechanisms above the melting line [5,13,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Origin of the irreversibility line in thinYBa2Cu3O
Prozorov
¹
,
Kończykowski
²
,
Schmidt
³

et al. 1996
Phys. Rev. B
20
0
6
0
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We report on measurements of the angular dependence of the irreversibility temperature T irr (θ) in Y Ba 2 Cu 3 O 7−δ thin films, defined by the onset of a third harmonic signal and measured by a miniature Hall probe. From the functional form of T irr (θ) we conclude that the origin of the irreversibility line in unirradiated films is a dynamic crossover from an unpinned to a pinned vortex liquid. In irradiated films the irreversibility temperature is determined by the trapping angle.

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Observation of separate vortex-melting and vortex-glass transitions in defect-enhancedYBa2Cu3

Cited by 129 publications

References 20 publications

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Vortices Freeze like Window Glass: The Vortex Molasses Scenario

Origin of the irreversibility line in thinYBa2Cu3O
Prozorov
¹
,
Kończykowski
²
,
Schmidt
³

et al. 1996
Phys. Rev. B
20
0
6
0
View full text Add to dashboard Cite

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Observation of separate vortex-melting and vortex-glass transitions in defect-enhancedYBa2Cu3

Cited by 129 publications

References 20 publications

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Vortices Freeze like Window Glass: The Vortex Molasses Scenario

Origin of the irreversibility line in thinYBa2Cu3OProzorov1, Kończykowski2, Schmidt3 et al. 1996Phys. Rev. B20060View full textAdd to dashboardCite

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About

Origin of the irreversibility line in thinYBa2Cu3O
Prozorov
¹
,
Kończykowski
²
,
Schmidt
³

et al. 1996
Phys. Rev. B
20
0
6
0
View full text Add to dashboard Cite