Current noise in HTC polycrystalline superconductors: A comparison between experiments and different types of percolation models

L. Cattaneo, M. Celasco, A. Masoero, P. Mazzetti, I. Puica, A. Stepanescu

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

Experimental results concerning current noise in ceramic high-Tc superconductors under different conditions of temperature and magnetic field are reported and compared with the results of different models based on percolation theory. It is assumed that under a magnetic field the specimens undergo a first stage transition where the grains become superconducting while the weak links are resistive. Further lowering of the temperature gradually increases the number of weak links that become superconducting, until a percolation threshold is reached which gives rise to macroscopic superconductivity. Two noise-generation models based on a switching model recently proposed by Kiss and Svedlindh, where a small number of weak links near a critical state undergo dynamic transitions from the normal to the superconducting state, are numerically developed and discussed. These models seem to give a much better account of the behavior of the noise intensity than a classical model, where the resistance of the weak links fluctuates. Comparison with the experiments is also given.

Lingua originaleInglese
pagine (da-a)127-146
Numero di pagine20
RivistaPhysica C: Superconductivity and its Applications
Volume267
Numero di pubblicazione1-2
DOI
Stato di pubblicazionePubblicato - 10 ago 1996
Pubblicato esternamente

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