Unusual current-voltage characteristics and dynamic correlation of rotating vortex-lattice rings

We report the unusual dc current-voltage (I-V) characteristics for the vortex-lattice rings rotated by a dc current I superimposed with ac currents of different amplitudes Irf in a Corbino disk of an amorphous MoxGe1−x film. As Irf is increased from zero, the I-V curve in the large I region shows a...

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Bibliographic Details
Published in:Superconductor science & technology 2015-04, Vol.28 (4), p.45002-7
Main Authors: Kawamura, Y, Matsumura, Y, Yamazaki, Y, Kaneko, S, Kokubo, N, Okuma, S
Format: Article
Language:English
Subjects:
Corbino disk
Correlation
Direct current
dynamic ordering
Dynamics
Electric potential
Fluid dynamics
Fluid flow
Rotating
Voltage
vortex-lattice rings
Vortices
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Summary:We report the unusual dc current-voltage (I-V) characteristics for the vortex-lattice rings rotated by a dc current I superimposed with ac currents of different amplitudes Irf in a Corbino disk of an amorphous MoxGe1−x film. As Irf is increased from zero, the I-V curve in the large I region shows a trend to decrease. This is in contrast to the usual behavior of vortex flow in which ac-induced depinning leads to an increase in the flow voltage. We attribute the finding to the Irf-induced growth in the transverse dynamic correlation of the rotating lattice rings.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/28/4/045002