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Article Dans Une Revue Journal of the Less Common Metals Année : 1990

Fundamental and contingent parameters in the description of transport properties of high Tc oxides

A. Raboutou
  • Fonction : Auteur
P. Peyral
  • Fonction : Auteur
C. Lebeau
  • Fonction : Auteur
J. Rosenblatt
  • Fonction : Auteur
Jean-Philippe Burin
Z. Z. Li
  • Fonction : Auteur

Résumé

Superconducting oxides like other materials, display intermingled microscopic ("ideal") and mesoscopic (usually sample-dependent) properties. By describing quantitatively the resistive transition we show that each contribution can be understood separately. A very simple grain-barrier model, together with the idea of a two-step superconducting transition and well-known theories of fluctuations in superconductors are the ingredients of this description. We thus identify the ideal critical temperature Tcs , even in degraded samples. Similarly other microscopic parameters like the coherence length in the c-direction and the distance between CuO2 planes, in good agreement with the crystallographic data, are obtained without adjustment from purely resistive measurements at T > Tcs .The relevant sample-dependent quantity is the barrier contribution to the total resistivity, and is obtained from measurements at T < Tcs . Finally, we discuss critical current measurements, and show that different behaviours, related to grain size and coupling, can be expected.
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Dates et versions

hal-00498837 , version 1 (08-07-2010)

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  • HAL Id : hal-00498837 , version 1

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A. Raboutou, P. Peyral, C. Lebeau, J. Rosenblatt, Jean-Philippe Burin, et al.. Fundamental and contingent parameters in the description of transport properties of high Tc oxides. Journal of the Less Common Metals, 1990, 164-165, pp.1400-1407. ⟨hal-00498837⟩
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