Babic, D. and Bentner, J. and Suergers, C. and Strunk, C. (2007) 1/f flux flow noise due to a coexistence of qualitatively different vortex states. PHYSICAL REVIEW B, 76 (13): 134515. ISSN 1098-0121,
Full text not available from this repository. (Request a copy)Abstract
We investigate the vortex-motion voltage noise in a hybrid structure consisting of a weak-pinning amorphous Nb(0.7)Ge(0.3) microbridge on top of which a strong-pinning, longitudinal Nb line with a narrow interruption in the middle is added. The Nb part enforces a branching of the applied current, causing a modulation of the current density within the Nb(0.7)Ge(0.3), where vortex motion induces a voltage. When the Nb(0.7)Ge(0.3) is sufficiently dissipative, the modulation is strong and the vortex dynamics is spatially dependent. Under these circumstances, the distribution function for normal excitations in vortex cores varies considerably over the sample, which results in a coexistence of distinct vortex states spreading from nearly equilibrium to strongly nonequilibrium ones. This leads to a range of characteristic times for the voltage fluctuations and, consequently, to the frequency (f) dependence of the noise being of 1/f type. The noise originates in the fluctuations of the vortex-core size around the average set by the nonequilibrium effects in vortex motion.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FLICKER 1-F NOISE; FILMS; SUPERCONDUCTORS; FLUCTUATIONS; INSTABILITY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Dec 2020 10:48 |
| Last Modified: | 01 Dec 2020 10:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32179 |
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