Generic phase diagram for vortex matter via a study of peak effect phenomenon in crystals of 2H-NbSe2

Banerjee, Srabani; Saha, Saumitra; Patil, N. G.; Ramakrishnan, S.; Grover, A. K.; Bhattacharya, S.; Ravikumar, G.; Mishra, Prerna; Rao, T. V. Chandrasekhar; Sahni, V. C.; Tomy, C. V.; Balakrishnan, G.; Paul, D. Mc K.; Higgins, M. J.

doi:10.1016/s0921-4534(98)00500-0

Cited by 31 publications

(39 citation statements)

References 31 publications

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“…[35] and in Fig. 2, notably the two-step character of the transition out of the BrG phase in some regions of parameter space and the reentrant nature of the phase boundaries at low fields, were described in earlier work [31][32][33][34]. into the disordered liquid [9,11,16,17,20].…”

Section: Much Theoretical Attention Hasmentioning

confidence: 63%

“…It is thus unlikely that the glassy phase obtained at low temperatures and elevated field values is a true phase-coherent vortex glass, in the sense of the original proposal [11]. However, many experiments in the peak effect regime of low and high-T c materials show that the multi-domain glass which intervenes between the BrG and the DL phases has strongly glassy properties [31,32,36,53,[74][75][76]. The data on low-T c systems favours an equilibrium transition [35] proposal.…”

Section: Universal Phase Diagram For Disordered Type-ii Supercondmentioning

confidence: 95%

“…In contrast, for most low-T c systems, such disordered phases occupy a relatively small regime just below T c (H). The phase behaviour in the mixed phase of low-T c superconductors has been the focus of recent attention [31][32][33][34][35]. These studies suggest a universal phase diagram for weakly pinned low-T c type-II materials [35].…”

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

“…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%

“…[35]. At low levels of disorder, the width of the sliver regime at intermediate fields is extremely narrow [31,34].…”

Section: Universal Phase Diagram For Disordered Type-ii Supercondmentioning

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: Much Theoretical Attention Hasmentioning

confidence: 63%

Section: Universal Phase Diagram For Disordered Type-ii Supercondmentioning

confidence: 95%

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

Section: Much Theoretical Attention Hasmentioning

confidence: 99%

“…[35]. At low levels of disorder, the width of the sliver regime at intermediate fields is extremely narrow [31,34].…”

Section: Universal Phase Diagram For Disordered Type-ii Supercondmentioning

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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Thermodynamics and Thermal Properties of the Superconducting State

Buckel¹,

Kleiner

2004

Superconductivity

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Study of the peak effect phenomenon in single crystals of 2H-NbSe2

et al. 2002

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The weakly pinned single crystals of the hexagonal 2H-NbSe 2 compound have emerged as prototypes for determining and characterizing the phase boundaries of the possible order-disorder transformations in the vortex matter. We present here a status report based on the ac and dc magnetization measurements of the peak effect phenomenon in three crystals of 2H-NbSe 2 , in which the critical current densities vary over two orders of magnitude. We sketch the generic vortex phase diagram of a weakly pinned superconductor, which also utilizes theoretical proposals. We also establish the connection between the metastability effects and pinning.

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Generic phase diagram for vortex matter via a study of peak effect phenomenon in crystals of 2H-NbSe2

Cited by 31 publications

References 31 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

Thermodynamics and Thermal Properties of the Superconducting State

Study of the peak effect phenomenon in single crystals of 2H-NbSe2

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