Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems release_44jzbwop5ravfdhkfwncbihj4u

by N. Pompeo, R. Rogai, M. Ausloos, R. Cloots, A. Augieri, G. Celentano, E. Silva

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2011  

Abstract

We report on microwave measurements on DyBa_2Cu_3O_7-δ monodomains grown by the top-seeded melt-textured technique. We measured the field increase of the surface resistance R_ s(H) in the a-b plane at 48.3 GHz. Measurements were performed at fixed temperatures in the range 70 K - T_ c with a static magnetic field μ_0H<0.8 T parallel to the c-axis. Low field steep increase of the dissipation, typical signature of the presence of weak links, is absent, thus indicating the single-domain behaviour of the sample under study. The magnetic field dependence of R_ s(H) is ascribed to the dissipation caused by vortex motion. The analysis of X_ s(H) points to a free-flow regime, thus allowing to obtain the vortex viscosity as a function of temperature. We compare the results with those obtained on RE-BCO systems. In particular, we consider strongly pinned films of YBa_2Cu_3O_7-δ with nanometric BaZrO_3 inclusions.
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Date   2011-03-04
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arXiv  1103.0858v1
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