Evidence of Current Stabilization after a Long-Time Decay in High-Tc Superconductors

H. Gonzalez-Jorge; D. Gonzalez-Salgado; J. Peleteiro; E Carballo; G. Domarco

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Evidence of Current Stabilization after a Long-Time Decay in High-Tc Superconductors

H. Gonzalez-Jorge·D. Gonzalez-Salgado·J. Peleteiro·E Carballo·G. Domarco

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Abstract

In this work, we studied the flux creep phenomenon over a long period [viz. about 1.5 10E7 s (i.e. for 6 months)] at liquid nitrogen temperature. For this purpose, four high-Tc ring-shaped samples were field-cooled (one sample) or ferromagnetic field-cooled (three samples) in order to induce a persistent current. The resulting current decay was measured using a Hall probe system and the results obtained revealed low relaxation rates in the ferromagnetic field-cooled samples. Also, the experimental data were found to depart from the prediction of the classical models after a long enough time. The slope of the logarithmic current decay plot exhibited an oscillatory phenomenon at ca. 2 10E5 s (about 55 hours). Oscillations vanished at ca. 4-5 10E6 s (46-55 days), after which the induced current remained stable throughout the remainder of the experiencing period.

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H. Gonzalez-Jorge, D. Gonzalez-Salgado, J. Peleteiro, E Carballo, G. Domarco. 2003-10-20. Evidence of Current Stabilization after a Long-Time Decay in High-Tc Superconductors. https://arxiv.org/abs/cond-mat/0310470

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