Topological order in the phase diagram for high-temperature superconductors with point defects

Kierfeld, Jan

doi:10.1016/s0921-4534(98)00138-5

Cited by 50 publications

(73 citation statements)

References 41 publications

(164 reference statements)

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“…Melting on T scans appears to occur discontinuously out of the MG at these field values [48,49]. Our MG phase is similar to the recently proposed "amorphous vortex glass" [23,50]. Like the "phase-incoherent vortex glass" studied in detail in Ref.…”

Section: Much Theoretical Attention Hassupporting

confidence: 81%

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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: Much Theoretical Attention Hassupporting

confidence: 81%

“…1 summarizes the currently popular view of the phase behaviour in the mixed phase of weakly disordered single crystals of anisotropic high-T c systems such as BSCCO [9,16,17,20,[23][24][25]. (This disorder is assumed to arise from a large density of weak point pinning sites in this paper [26].)…”

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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“…As has already been mentioned above, only the intersection point of the melting and the order-disorder lines has a physical meaning rather than the end point of H dis (t). The temperature of this intersection point, t i , can be simply estimated using formulas (26) and (30). Then we arrive at the following equation for t i :…”

Section: B Approximate Formulas Discussionmentioning

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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“…The use of the square crystals provides therefore a unique method to study the true bulk vortex properties in the quasi-lattice or Bragg glass phase [20][21][22][23] below the FOT. Figure 5 shows an example of the resistive behavior of square crystal at 100 Oe for various currents.…”

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confidence: 99%

Transport Properties ofBi2Sr2CaCu2O<

et al. 1998

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Bi2Sr2CaCu2O8 crystals with electrical contacts positioned far from the edges are studied by transport measurements, then cut into narrow strip geometry, and remeasured. Instead of showing larger resistance, the strips display a dramatic drop in the resistance, enhanced activation energy, and nonlinear behavior due to strong surface barriers. The surface barriers also dominate the resistive drop at the first-order phase transition. Because the surface barriers are avoided in large crystals, we are able to probe the solid phase and find good agreement with the recent predictions of Bragg glass theory.

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Topological order in the phase diagram for high-temperature superconductors with point defects

Cited by 50 publications

References 41 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

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

Transport Properties ofBi2Sr2CaCu2O<

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