We study the effects of dielectric or semiconductor substrates on the surface impedance of high-Tc Superconductor (HTS) films of YBa2Cu3O7–d (YBCO). The characteristic impedance of Silicon (Si) (for different doping levels and for different charge carriers scattering times) and of commonly used dieletric materials, has been preliminarly evaluated. In particular, the most relevant features of Si electrodynamic behaviour are highlighted by the introduction of suitable normalized quantities. The effective surface impedance of the YBCO films on Si or dielectric substrates is then calculated and discussed for different temperatures and frequencies in the microwave range up to 50 GHz, comparing the obtained results to their limiting expressions for bulk and thin-film HTS. It is analysed how the widely used thin-film approximation for the surface impedance can fail, critically highlighting the conditions it requires to be correctly used. Measures of the surface resistance and reactance of YBCO films on dielectric (SrTiO3) substrates, showing dramatic substrates effects, are reported and compared with the above mentioned theoretical results. It is shown that substrate contributions can heavily influence the HTS films response.

Marcon, R., Silva, E., Pompeo, N. (2004). Substrate contribution to the surface impedance of HTS films.

Substrate contribution to the surface impedance of HTS films

MARCON, Romolo;POMPEO, NICOLA
2004-01-01

Abstract

We study the effects of dielectric or semiconductor substrates on the surface impedance of high-Tc Superconductor (HTS) films of YBa2Cu3O7–d (YBCO). The characteristic impedance of Silicon (Si) (for different doping levels and for different charge carriers scattering times) and of commonly used dieletric materials, has been preliminarly evaluated. In particular, the most relevant features of Si electrodynamic behaviour are highlighted by the introduction of suitable normalized quantities. The effective surface impedance of the YBCO films on Si or dielectric substrates is then calculated and discussed for different temperatures and frequencies in the microwave range up to 50 GHz, comparing the obtained results to their limiting expressions for bulk and thin-film HTS. It is analysed how the widely used thin-film approximation for the surface impedance can fail, critically highlighting the conditions it requires to be correctly used. Measures of the surface resistance and reactance of YBCO films on dielectric (SrTiO3) substrates, showing dramatic substrates effects, are reported and compared with the above mentioned theoretical results. It is shown that substrate contributions can heavily influence the HTS films response.
2004
Marcon, R., Silva, E., Pompeo, N. (2004). Substrate contribution to the surface impedance of HTS films.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/273325
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