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12 results on '"Sparvieri, N."'

4. Anisotropic renormalized fluctuations in the microwave resistivity in YBCO

Author

Neri, D., Silva, E., Sarti, S., Marcon, R., Giura, M., Fastampa, R., and Sparvieri, N.

Subjects
Superconductivity (cond-mat.supr-con), Condensed Matter::Superconductivity, Condensed Matter - Superconductivity, FOS: Physical sciences
Abstract

We discuss the excess conductivity above Tc due to renormalized order-parameter fluctuations in YBCO at microwave frequencies. We calculate the effects of the uniaxial anisotropy on the renormalized fluctuations in the Hartree approximation, extending the isotropic theory developed by Dorsey [Phys. Rev. B 43, 7575 (1991)]. Measurements of the real part of the microwave resistivity at 24 and 48 GHz and of the dc resistivity are performed on different YBCO films. The onset of the superconducting transition and the deviation from the linear temperature behavior above Tc can be fully accounted for by the extended theory. According to the theoretical calculation here presented, a departure from gaussian toward renormalized fluctuations is observed. Very consistent values of the fundamental parameters (critical temperature, coherence lenghts, penetration depth) of the superconducting state are obtained., RevTex, 8 pages with 5 figures included, to be published in Physical Review B

Published
1998

7. Fabrication of melt textured YBCO samples

Author

Di Trolio, A., Pace, Sandro, Saggese, Aniello, Testa, A. M., and Sparvieri, N.

Subjects
superconductivity, high Tc materials, fabrication
Published
1994

11. On the field cooled susceptibility of YBaCuO sample

Author

Celani, F., Messi, R., Sparvieri, N., Pace, Sandro, Saggese, Aniello, Giovannella, C., Fruchter, L., and Chappert, C.

Subjects
Superconductivity, High Tc materials, magnetic properties
Published
1988

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