Published March 1, 2005
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Surface pinning in an amorphous ZrTiCuNiBe alloy
Chicago
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Abstract
We have measured the amplitude and the phase of an electromagnetic (EM) field radiated from a superconductor (amorphous ZrTiCuNiBe alloy) in the mixed state due to the interaction of the flux lattice with an elastic wave. The results point to an essential contribution of a surface pinning into the flux lattice dynamics. We propose a model that describes radiation of the EM field from superconductors with nonuniform pinning. The model allows us to reconstruct the viscosity and the Labusch parameters from the experimental data. The behavior of the Labusch parameter can be qualitatively explained in terms of the collective pinning theory with the allowance of thermal fluctuations.
Additional Information
©2005 The American Physical Society. Received 23 December 2004; published 24 March 2005. This study was supported in part by CRDF (Grant No. UP1-2566-KH-03), by INTAS (Grant No. 03-51-3036), and by Ukrainian Government Foundation for Basic Research (Grant No. 0207/00359). We would like to thank G. P. Mikitik and K. V. Maslov for helpful discussions.Files
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