Plastic Motion of Current-Driven Vortex Glass in the Corbino Disk (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report on current-voltage (I-V) characteristics for a thick amorphous Mo_xSi_<1-x> film both in conventional strip-like and Corbino-disk (CD) contact geometries. In CD, vortices rotate around the sample center and we can control the gradient as well as the strength of the Lorentz force acting on the vortices. In the vortex-liquid phase, we find no significant difference in the shape of I-V curves between the two geometries, while in the vortex-glass phase anomaly in the I-V curves is visible in CD as a dip in d log V/d log I at a characteristic current I. Using recent simulation work by Miguel and Zapped, we suggest that a change in the vortex dynamics from plastic flow to laminar (liquid-like) flow occurs at approximately I.
- 社団法人日本物理学会の論文
- 2004-03-15
著者
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Kamada M.
Research Center for Development of Far-Infrared Region, University of Fukui
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Okuma Satoshi
Department Of Physics Faculty Of Science University Of Tokyo
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Kamada M.
Research Center For Development Of Far-infrared Region University Of Fukui
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OKUMA S.
Research Center for Low Temperature Physics, Tokyo Institute of Technology
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Okuma S
Research Center For Low Temperature Physics Tokyo Institute Of Technology
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Okuma S.
Research Center For Low Temperature Physics Tokyo Institute Of Technology
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