Microwave properties of DyBCO monodomain in the mixed state and comparison with other RE-BCO systems
| Autor: | Pompeo, N., Rogai, R., Ausloos, M., Cloots, R., Augieri, A., Celentano, G., Silva, E. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physc.2011.05.073 |
| Popis: | We report on microwave measurements on DyBa$_2$Cu$_3$O$_{7-\rm\delta}$ monodomains grown by the top-seeded melt-textured technique. We measured the field increase of the surface resistance $R_{\rm s}(H)$ in the a-b plane at 48.3 GHz. Measurements were performed at fixed temperatures in the range 70 K - $T_{\rm c}$ with a static magnetic field $\mu_0H<0.8$ 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 $R_{\rm s}(H)$ is ascribed to the dissipation caused by vortex motion. The analysis of $X_{\rm s}(H)$ 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$_2$Cu$_3$O$_{7-\rm\delta}$ with nanometric BaZrO$_3$ inclusions. Comment: 17 pages, 5 figures; ISS2010 proceedings, to be published as a special issue of Physica C |
| Databáze: | arXiv |
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