Unusual vortex dynamics in the quantum-liquid phase of a-MoxSi1−x
films |
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Authors: | S Okuma |
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Institution: | (1) Research Center for Low Temperature Physics, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, 152-8551 Tokyo, Japan |
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Abstract: | We find the unusual vortex dynamics in the low-temperature liquid phase of amorphous MoxSi1−x films by measuring the fluctuating component of the flux-flow voltage δV(t) about the average voltage. For the thick film, in which the quantum vortex liquid (QVL) phase has been well-determined in
the field-temperature plane, δV(t) originating from the vortex motion is clearly visible in the QVL phase, where the distribution of δV(t) is anomalously asymmetric, implying large velocity and/or number fluctuations of driven vortices. For the thin film, in
which the QVL phase has not been determined from the static transport measurements, similar unusual vortex motion is observed
in nearly the same reduced-temperature regime. We suggest that vortex dynamics in the low-temperature liquid phase of thick
and thin films is dominated by common physical mechanisms related to quantum-fluctuation effects. |
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Keywords: | Flux flow quantum liquid fluctuations superconductor-insulator transition |
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