Pronounced changes in low-frequency noise power spectra have been observed, close to the transition temperature, in current biased high-T(c) superconducting thin films. Generally, the spectra scale as 1/f(alpha), where 0.5 < alpha < 2 and depends strongly on temperature and dc current flow. We attribute most of the changes in a to the activation of Random Telegraph Signals due to flux hopping processes. However, peaks of excess noise that show out at certain current flows can not be explained by the action of elementary two-level fluctuators, clearly indicating yet another mechanism contributing to the 1/f power spectra.

Gierlowski, P., Jung, G., Kula, W., Lewandowski, S.j., Savo, B., Sobolewski, R., et al. (1994). Low frequency voltage noise in current biased HTCS thin films. PHYSICA. B, CONDENSED MATTER, 194-196, 2043-2044.

Low frequency voltage noise in current biased HTCS thin films

TEBANO, ANTONELLO;
1994-01-01

Abstract

Pronounced changes in low-frequency noise power spectra have been observed, close to the transition temperature, in current biased high-T(c) superconducting thin films. Generally, the spectra scale as 1/f(alpha), where 0.5 < alpha < 2 and depends strongly on temperature and dc current flow. We attribute most of the changes in a to the activation of Random Telegraph Signals due to flux hopping processes. However, peaks of excess noise that show out at certain current flows can not be explained by the action of elementary two-level fluctuators, clearly indicating yet another mechanism contributing to the 1/f power spectra.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - Fisica della Materia
English
Con Impact Factor ISI
Electric currents; Magnetic field effects; Spurious signal noise; Superconducting films; Superconducting transition temperature; Thermal effects; Thin films; Current bias; DC current flow; Flux hopping process; Low frequency voltage noise; Power density spectrum; Random telegraph noise; Two level fluctuators; High temperature superconductors
Gierlowski, P., Jung, G., Kula, W., Lewandowski, S.j., Savo, B., Sobolewski, R., et al. (1994). Low frequency voltage noise in current biased HTCS thin films. PHYSICA. B, CONDENSED MATTER, 194-196, 2043-2044.
Gierlowski, P; Jung, G; Kula, W; Lewandowski, Sj; Savo, B; Sobolewski, R; Tebano, A; Vecchione, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/51493
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