Vortex dynamics in La1.86Sr0. 14CuO4 studied by magnetoresistivity |
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| Authors: | S. L. Yuan Z. J. Yang K. Kadowaki J. Q. Li T. Kimura H. Takeya |
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| Affiliation: | 1. High Magnetic Field Laboratory, Institute of Plasma Physics, Academia Sinica , Hefei, 230031, PR China;2. Argonne National Laboratory , Argonne, Illinois, 60439-4825, USA;3. National Research Institute for Metals, Tsukuba Laboratory , Ibaraki, 305, Japan;4. Department of Physics , Wuhan Institute of Technology , PR China;5. Department of Industrial Chemistry , University of Tokyo , Hongo 7-3-1, Tokyo, 113, Japan |
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| Abstract: | Abstract Vortex dynamics in La1.86Sr0.14CuO4 have been studied by the measurement of ρc //i (T, H), where ρc //i is the c-axis resistivity for H//i (i = c or a-b). We argue that, at temperatures higher than the irreversibility temperature T irr, the usual vortex picture breaks down owing to the thermal motion of vortices, resulting in a T- and T in-dependent anisotropic parameter γ. After taking into account the dependence of γ on T and T irr, we show that at each given temperature we can rescale the ρc //a-b (T, H) data onto the corresponding ρc //c (T, H) curves. This scaling property clearly indicates that the Lorentz-force-free mechanism is responsible for ρc //a-b (T, H). Furthermore, we also show that the measured ρc //a-b (T, H) data can be explained in terms of the recently developed extended Josephson coupling model which is verified by rescaling ρc //a-b (T) data for various fields onto a single curve. |
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