Relevance of the scheme of regularization of the density-of-state fluctuation contribution in an arbitrary magnetic field

Thopart, D.; Wahl, A.; Warmont, F.; Simon, Ch.; Soret, J. C.; Ammor, L.; Ruyter, A.; Buzdin, Alexandre I.; Varlamov, A. A.; Brion, S. de

doi:10.1103/physrevb.62.9721

Cited by 5 publications

(15 citation statements)

References 35 publications

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“…This makes such results agree also with some others already reported for Bi-2212. 10,11,26 As far s is concerned, the results appear to be sample dependent and resembling the ones that can be extracted by applying the pure 2D AL formula near T c , as it was done in the inset of Fig. 1.…”

supporting

confidence: 58%

“…21 This implies a ratio T c /Θ D ≈ 0.3, which corresponds to a temperature range where no deviation from linearity is observed in the most common metals. The problems involved in this assumption have been often overcome by the measurement of the in-field paraconductivity ∆σ (B, T ) = 1/ρ a (B, T )−1/ρ a (0, T ), 8,9,10,11,12,13,22,23,24,25,26,27 but in principle a drawback in this approach is the possible presence of ordinary magnetoresistance effects, which add to superconducting fluctuations. 25 On the other hand, it has been recently reported 12 that the simple assumption of a linear T dependence leads to the same conclusions.…”

Section: Data Analysis and Discussionmentioning

confidence: 99%

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Possible dominance of the Maki–Thompson process in the fluctuation conductivity of Bi-2212 superconducting whiskers

Truccato¹,

Agostino²,

Rinaudo³

et al. 2006

J. Phys.: Condens. Matter

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We report the measurement of the a-axis fluctuation conductivity in zero field for Bi2Sr2CaCu2O8+x microcrystals. A good geometrical characterization and an original method for data analysis allow to determine its temperature behaviour to a high accuracy. The correct application of the complete fluctuation theory [A. A. Varlamov et al., Adv. Phys. 48, 655 (1999)], with a minor correction for thek factor, leads to the conclusion that the anomalous MT term is the most important contribution throughout the whole temperature range of interest. More traditional alternative interpretations of the experimental data are also investigated and their inconsistency is demonstrated. This implies an s-wave symmetry for the order parameter and could provide a physical mechanism for the preformed pair scenario.

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supporting

confidence: 58%

Section: Data Analysis and Discussionmentioning

confidence: 99%

Possible dominance of the Maki–Thompson process in the fluctuation conductivity of Bi-2212 superconducting whiskers

Truccato¹,

Agostino²,

Rinaudo³

et al. 2006

J. Phys.: Condens. Matter

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“…The solid line represents the theoretical calculation. The symbols are the experimental magnetoconductivity ∆σzz(B c I) [155] contribution can contribute in the case of small pairbreaking only, which is opposite to what is expected in HTS.…”

Section: 1mentioning

confidence: 94%

“…(78)). The corresponding asymptotics for all out-of-plane fluctuation contributions are presented in the following table: Table 3 The procedure described gives an excellent fitting up to very high fields [155] which is shown in Fig . 13.…”

Section: 1mentioning

confidence: 97%

“…The effects of fluctuations on magnetoconductivity [97,127,154,155] The experimental investigations of the fluctuation magnetoconductivity are of special interest first because this physical value weakly depends on the normal state properties of superconductor and second due to its special sensitivity to temperature and magnetic field. The role of AL contribution for both the in-plane and out-of-plane magnetoconductivities was studied above in the framework of the phenomenological approach.…”

Section: 1mentioning

confidence: 99%

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Fluctuation Phenomena in Superconductors

Larkin

Varlamov²

Superconductivity

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6. Manifestation of fluctuations in various properties 6.1 The effects of fluctuations on magnetoconductivity 6.2 Fluctuations far from T c or in strong magnetic fields 6.2.1 Fluctuation magnetic susceptibility far from transition. 6.2.2 Fluctuation magnetoconductivity far from transition 6.2.3 Fluctuations in magnetic fields near H c2 (0) 6.3 The effect of fluctuations on the Hall conductivity 6.4 Fluctuations in the ultra-clean case 6.5 The effect of fluctuations on the one-electron density of states and on tunneling measurements 6.5.1 Density of states 6.5.2 The effect of fluctuations on the tunnel current 6.6 Nonlinear fluctuation effects 6.7 The effect of fluctuation on the optical conductivity 6.8 Thermoelectric power above the superconducting transition 6.9 The effect of fluctuations on NMR characteristics 6.9.1 Preliminaries. 6.9.2 Spin Susceptibility. 6.9.3 Relaxation Rate. 7. Conclusions 8. Acknowledgments 9. Bibliography 2 Strictly speaking τ in the most part of future results should be understood as the electron transport scattering time τtr. Nevertheless, as it is well known, in the case of isotropic scattering these values coincide, so for sake of simplicity we will use hereafter the symbol τ.

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