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40 results on '"Fastampa, Renato"'

1. A microwave broadband technique to measure the complex resistivity of HTS thin films

Author

Tosoratti, Nevio, Fastampa, Renato, Giura, Maurizio, Lenzi, Vasco, Sarti, Stafano, and Silva, Enrico

Subjects
High temperature superconductivity -- Research, Thin films -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A new microwave broadband method for measuring the complex resistivity of high temperature superconducting thin films is proposed.

Published
2001

12. Dynamic regimes in YBCO in applied magnetic field probed by swept frequency microwave measurements

Author

Sarti, Stefano, Giura, Maurizio, Fastampa, Renato, Silva, E, Amabile, C, Boffa, M, Cucolo, A. M., Sarti, S, Silva, Enrico, Giura, M, Fastampa, R, Boffa, M, and Cucolo, Am

Subjects
Condensed matter physics, Electrical resistivity and conductivity, Chemistry, Plane (geometry), Condensed Matter::Superconductivity, Continuum (design consultancy), General Materials Science, Dissipation, Condensed Matter Physics, Microwave, Line (formation), Vortex, Magnetic field
Abstract

We report measurements of the microwave resistivity in YBa2Cu3O7-delta (YBCO), in the presence of an applied magnetic field. Measurements are performed as a function of frequency, over a continuum spectrum between 6 and 20 GHz, by means of a Corbino disc geometry. These data allow for a direct identification of different dynamical regimes in the dissipation of YBCO in the presence of an applied magnetic field. While at high temperatures a frequency independent resistivity is observed, at lower temperatures we find a marked frequency dependence. The line in the (H, T) plane at which this change in the dynamical regime is observed is clearly identified and discussed in terms of vortex motion and fluctuational resistivity.

Published
2004

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