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Vortices and DynamicsNo Access

BROADBAND NOISE ACROSS THE MODE-LOCKING FREEZING IN DRIVEN VORTEX MATTER

Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan

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Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8551, Japan

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Center for Research and Advancement in Higher Education, Kyushu University, 4-2-1, Ropponmatsu, Chuoh-ku, Fukuoka 810-0044, Japan

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https://doi.org/10.1142/S0217979207044597Cited by:3 (Source: Crossref)

Abstract

We report on the measurements of broadband voltage noise generated by the driven vortex matter in and just below the peak-effect regime of a thick amorphous Mo_xGe_1-x film. We focus on a change in broadband noise as the system undergoes the mode-locking (ML) resonance (ML freezing), which occurs when the ac drive superimposed on the dc drive excites the lattice-oscillation modes collectively. Independent of the field studied, the noise spectrum at low frequencies f is of Lorentzian type, while it is f-independent at high f (but well below the ac-drive frequency). We find that the magnitude of noise at high f decreases in the ML resonance.

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Vol. 21, No. 18n19

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Received 8 January 2007

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