Flux pinning, specific heat and magnetic properties of the laves phase superconductor CeRu<sub>2</sub>

Huxley, A.; Paulson, C.A.J.; Laborde, O.; Tholence, J.L.; Sánchez, Daniel H.; Junod, A.; Calemczuk, R.

doi:10.1088/0953-8984/5/41/018

Cited by 146 publications

(111 citation statements)

References 22 publications

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“…This is valuable information for the interpretation of universal features in the phase diagram of type-II superconductors, e.g., the broadening of the H c2 line in fields 25,38 and the peak effect. [13][14][15][16][17][18] …”

Section: Discussionmentioning

confidence: 99%

“…Improving sample quality and experimental sensitivity to observe critical fluctuations thus poses a significant challenge to the experimentalist. Nevertheless, some "universal" features in the fieldtemperature phase diagram of classical type-II superconductors, e.g., a broadening of the upper-critical field line ͓H c2 or T c ͑H͔͒ or a peak effect [13][14][15][16][17][18] show analogies with the HTSCs. New high-resolution calorimetric methods which we developed during years of study on the HTSCs motivated us to investigate whether fluctuation effects and vortex melting might also be responsible in this case.…”

Section: Introductionmentioning

confidence: 99%

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Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

et al. 2006

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The range of critical thermal fluctuations in "classical" bulk superconductors is extremely small and especially in low fields hardly experimentally accessible. With a new type of calorimeter we have been able to resolve a small lambda anomaly within a narrow temperature range around the H c2 line. We show that the evolution of the anomaly as a function of magnetic field follows scaling laws expected in the presence of critical fluctuations. The lower onset of the fluctuation regime shows many characteristics of a continuous solid-to-liquid transition in the vortex matter. It can be driven into a first-order vortex melting transition by a small ac field which helps the vortex matter to reach equilibrium.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

et al. 2006

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“…al. [114,38] described a sharp reversible to irreversible transition in the mixed state close to H c2 [108]. The possible relation of these results to a phase transition into a novel modulated superconducting phase (the FFLO state [115]) was discussed by these authors and later investigated extensively by others.…”

Section: Cerumentioning

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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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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“…Also, inspection of the corresponding C/T vs. T plot (Sereni et al 1989) shows that C ≈ -AT + BT 2 between 2K and 6K, rather than C ≈ BT 2 which was implied, so the claim of T 2 behavior in this range is misleading. There is thus no clear qualitative disagreement with Huxley et al (1993) and Hedo et al (1998). (2) The claims of 14 conventional behavior, for specific heat (Huxley et al 1993, Hedo et al 1998 and also for 1/T 1 of NQR (Matsuda et al 1995, Mukuda et al 1998, are not based on T AE 0 data but on data typically with T > T c /4, so the obtained effective gap values do not represent the D min of an anisotropic gap.…”

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confidence: 97%

Strongly anisotropic s-wave gaps in exotic superconductors

Brandow

2003

Philosophical Magazine

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The exotic superconductors, defined as those which follow the phenomenological trend of Uemura (T c approximately µ l L -2 ), presently constitute the most broad and general class of superconductors which can reasonably be considered "similar to the high-T c cuprates". It is therefore of much interest to determine the forms of their pairing gap functions. We examine evidence for the gap forms in non-cuprate exotics, and demonstrate some general features. The cubic materials often have highly anisotropic gaps. The planar materials tend to have even stronger gap anisotropy, to the extent that they often have gap nodes, but nevertheless they usually have an s-wave-like gap symmetry. There is good evidence for the latter even in the controversial cases of planar organics and nickel borocarbides. Exceptions to these generalizations are also pointed out and discussed. §1. INTRODUCTIONThere are now many unusual superconductors which are recognized to share some of the novel features of the high-T c cuprate superconductors. The possibility of further similarity to the cuprates, in particular the possibility of pairing by exchange of a virtual spin fluctuation or paramagnon, has motivated suggestions of d-wave gap forms in some of these other superconductors, in cases where there is evidence for gap nodes. This argument has been applied especially to the planar organics and sometimes also to the 2 nickel borocarbides, in addition to the well known cases of heavy-fermion materials. This line of reasoning calls for a careful examination of the evidence for the gap forms in these and other unusual superconductors.In this paper we focus on the exotic superconductors of Uemura and co-workers. 1 These exotics include a number of the unusual superconductors of earlier (pre-cuprate) interest, as well as the cuprates themselves and others discovered after the cuprates, and they include most of the materials previously suggested as being similar to the cuprates. 2 As discussed below, they now constitute the most broad and general class of superconductors that can reasonably be considered similar to the cuprates. (The variety of crystal structures and material chemistries in this class of materials is remarkably extensive.2 ) It is therefore very reasonable to focus on these materials. We now examine many of the non-cuprate exotic materials and material families, those for which there is reasonable gap-form evidence, in order to establish two general conclusions about their superconducting phenomenology: (1) In the cubic and nearly-cubic materials, which are conventionally expected to have nearly isotropic gaps, there is often evidence of very strong gap anisotropy. Sometimes there even appear to be gap nodes, although the gap symmetry remains s-wave-like. (2) In the planar (quasi-two-dimensional) materials there are often gap nodes, but nevertheless they typically still have an s-wave-like gap symmetry.[Here s-wave-like means having the full point-group symmetry of the crystal structure, a condition which does allow the p...

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Flux pinning, specific heat and magnetic properties of the laves phase superconductor CeRu₂

Cited by 146 publications

References 22 publications

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

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

Strongly anisotropic s-wave gaps in exotic superconductors

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Flux pinning, specific heat and magnetic properties of the laves phase superconductor CeRu2

Cited by 146 publications

References 22 publications

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

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

Strongly anisotropic s-wave gaps in exotic superconductors

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Flux pinning, specific heat and magnetic properties of the laves phase superconductor CeRu₂