Analysis of the current noise produced in stationary conditions in MgB 2 films at different stages of the superconducting transition

E. Monticone, C. Portesi, E. Taralli, M. Rajteri, V. Andreoli, C. Gandini, A. Masoero

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

In previous papers (Mazzetti et al. in Phys. Rev. B 77:064516, 2008; Ponta et al. in Phys. Rev. B 79:134513, 2009) the mechanism of resistive transition of MgB 2 films has been investigated by the analysis of the non-stationary noise produced during the transition process. The developed model suggested that when the transition occurs very near to T C at low bias current, a mixed state, consisting of normal and superconductive domains, takes place. A different model based on fluxoids dynamics, generated by the current and/or by an external field, is appropriate when the transition occurs at strong bias currents and temperatures much lower than T C. The purpose of this paper is a further investigation of the transition process at low bias currents by analyzing the 1/f power spectra of the noise, taken in stationary conditions at different values of the specimen resistance. These spectra, when renormalized to represent the relative fluctuation of the specimen resistance, are practically coincident, a fact in agreement with the developed model.

Lingua originaleInglese
pagine (da-a)1111-1115
Numero di pagine5
RivistaJournal of Superconductivity and Novel Magnetism
Volume24
Numero di pubblicazione1-2
DOI
Stato di pubblicazionePubblicato - gen 2011
Pubblicato esternamente

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