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Safar, H.; Gammel, P. L.; Huse, David A.; Bishop, David J.; Lee, W. C.; Giapintzakis, J.; Ginsberg, D. M.

doi:10.1103/physrevlett.70.3800

Cited by 246 publications

(132 citation statements)

References 20 publications

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“…These arguments therefore suggest that the melting transition of the vortex glass into a vortex liquid will become a continuous transition as the effective dimensionality decreases and the strength of disorder increases. Recent experiments on untwinned, single crystal Y Ba 2 Cu 3 O 7 by Safar and coworkers [66] find a behavior that can be reconciled with the above theoretical picture. They find a hysteretic, abrupt, first-order transition at weak applied fields H which becomes a continuous transition at higher H. It is also observed that the first-order regime increases as pinning decreases with the tricritical point moving in a range 5 − 15 Tesla.…”

Section: Stability Of First-order Transition To Disordersupporting

confidence: 48%

Statistical Mechanics of Vortices in Type-II Superconductors

Huse

Radzihovsky

1994

Fundamental Problems in Statistical Mechanics, VIII

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Thermal fluctuations and disorder play an essential role in high-T c superconductors. After reviewing the mean-field phase diagram we describe significant modifications that result when the effects of finite temperature and disorder are incorporated. Thermal fluctuations cause the melting of the Abrikosov flux line lattice into a vortex liquid at high temperatures, and disorder produces novel glass phases at low temperatures. We analyze phase transitions between these new phases and describe transport properties in various regimes.

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Section: Stability Of First-order Transition To Disordersupporting

confidence: 48%

Statistical Mechanics of Vortices in Type-II Superconductors

Huse

Radzihovsky

1994

Fundamental Problems in Statistical Mechanics, VIII

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“…17 In principle, two scenarios are possible. In the first one 22 the upper critical point does not coincide with the intersection point of the melting and the order-disorder lines and is located at a higher magnetic field than this intersection point.…”

Section: B Approximate Formulas Discussionmentioning

confidence: 99%

“…[1][2][3][4][5] In the high-T c YBaCuO crystals, the line of the maximum critical current density, H p (T ), frequently lies essentially below the irreversibility line in the H − T plane, [6][7][8][9] and in sufficiently perfect crystals it exhibits nonmonotonic behavior with temperature. [10][11][12][13][14][15][16] In these perfect crystals the line of maximum current density approaches the flux-line melting line, H m (T ), approximately at the so-called upper critical point 17 at which the melting line terminates. When the oxygen deficiency δ in YBa 2 Cu 3 O 7−δ increases or the crystal becomes less perfect, the end point tends to the superconducting transition temperature T c at zero magnetic field, while H p (T ) becomes a monotonically decreasing function.…”

Section: Introductionmentioning

confidence: 99%

Peak effect, vortex-lattice melting line, and order-disorder transition in conventional and high-Tcsuperconductors

2001

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We investigate the order-disorder transition line from a Bragg glass to an amorphous vortex glass in the H − T phase diagram of three-dimensional type-II superconductors taking into account both pinning-caused and thermal fluctuations of the vortex lattice. Our approach is based on the Lindemann criterion and on results of the collective pinning theory and generalizes previous work of other authors. It is shown that the shapes of the order-disorder transition line and the vortex lattice melting curve are determined only by the Ginzburg number, which characterizes thermal fluctuations, and by a parameter which describes the strength of the quenched disorder in the fluxline lattice. In the framework of this unified approach we obtain the H − T phase diagrams for both conventional and high-Tc superconductors. Several well-known experimental results concerning the fishtail effect and the phase diagram of high-Tc superconductors are naturally explained by assuming that a peak effect in the critical current density versus H signalizes the order-disorder transition line in superconductors with point defects.

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“…1 and the above discussion about T K in the vortex matter in HTSCs. With the introduction of random vortex pinning defects, however, the first-order melting transition vanishes and is replaced by a more continuous transition 4,[11][12][13][14] , commonly referred to as the 'vortex-glass' transition. There is evidence for different glassy phases (Bose glass, Bragg Glass and vortex glass) 4 , the detailed nature of which however remains controversial.…”

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confidence: 99%

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

et al. 2007

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Using high-resolution thermal expansion and magnetization measurements, we provide experimental evidence for a kinetic glass transition in the vortex matter of YBa 2 Cu 3 O 7-δ with some disorder. This transition, which represents the true superconducting transition in a magnetic field, exhibits many of the features of the usual glass transition found in supercooled structural liquids such as window glass. We demonstrate, using both kinetic and thermodynamic criteria, that this vortex matter is the most fragile system known to date, which we argue makes it possible to investigate the behavior very close to the Kauzmann temperature. Vortex matter, we suggest, may be a model system to study glassy behavior in general, which is expected to lead to a better understanding of the strong-fragile behavior in structural glasses.

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Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinnedYBa2Cu

Cited by 246 publications

References 20 publications

Statistical Mechanics of Vortices in Type-II Superconductors

Statistical Mechanics of Vortices in Type-II Superconductors

Peak effect, vortex-lattice melting line, and order-disorder transition in conventional and high-Tcsuperconductors

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

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