Reduction in the field-dependent microwave surface resistance in YBa

N. Pompeo, R. Rogai, A. Augieri, V. Galluzzi, G. Celentano, E. Silva

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Abstract

In order to study the vortex pinning determined by artificially introduced pinning centers in the small-vortex displacement regime, we measured the microwave surface impedance at 47.7 GHz in the mixed state of YBa2Cu3O7-δ; thin films, where submicrometric BaZrO3 particles have been incorporated. As a function of the BaZrO3content, we observed that the absolute losses slightly decrease up to a BaZrO3content of 5%, and then increase. We found that the magnetic-field-induced losses behave differently in that they are not monotonic with increasing BaZrO3concentration. At small concentration (2.5%) the field-induced losses increase, but large reduction in the losses themselves, by factors up to 3, is observed upon further increasing the BaZrO3concentration in the target up to 7%. Using measurements of both surface resistance and surface reactance, we estimate vortex pinning-related parameters. We found that BaZrO3inclusions introduce deep and steep pinning wells. In particular, the minimum height of the energy barrier for single vortices is raised. At larger BaZrO3content (5% and 7%) the phenomenon is at its maximum, but it is unclear whether it shows a saturation or not, leaving room for further improvements. © 2009 American Institute of Physics.
Original languageEnglish
Article number013927
Pages (from-to)-
JournalJournal of Applied Physics
Volume105
Issue number1
DOIs
Publication statusPublished - 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Pompeo, N., Rogai, R., Augieri, A., Galluzzi, V., Celentano, G., & Silva, E. (2009). Reduction in the field-dependent microwave surface resistance in YBa. Journal of Applied Physics, 105(1), -. [013927]. https://doi.org/10.1063/1.3056179