A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB2 superconducting thin films

A. Andreone; E. Di Gennaro; G. Lamura; M. Salluzzo; A. Purnell; L. F. Cohen; L. Hao; J. Gallop; C. Cantoni; M. Paranthaman

doi:10.1088/0953-2048/16/2/323

A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB₂ superconducting thin films

A. Andreone, E. Di Gennaro, G. Lamura, M. Salluzzo, A. Purnell, L. F. Cohen, L. Hao, J. Gallop, C. Cantoni, M. Paranthaman

Nanomaterials Chemistry Group

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

We present a study on the temperature and field dependence of the microwave surface impedance Z_s in thin films of the superconducting MgB₂ compound. Samples were prepared by e-beam evaporation of boron on r-plane sapphire followed by an ex situ annealing in Mg vapour. Critical temperature values range between 26 and 38 K. Surface impedance measurements (Z_s = R_s + iX_s) were performed from 2 K close to T_c in the microwave region up to 20 GHz via parallel plate or dielectrically loaded resonators in 'symmetric' (two MgB₂ films) and asymmetric (an MgB₂ film and a commercial YBCO control film) configurations. At high microwave power, frequency domain measurements show a characteristic signature associated with weak links and this appears to be the limiting factor governing the performance of these films.

Original language	English
Pages (from-to)	260-263
Number of pages	4
Journal	Superconductor Science and Technology
Volume	16
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/16/2/323
State	Published - Feb 2003

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title = "A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB2 superconducting thin films",

abstract = "We present a study on the temperature and field dependence of the microwave surface impedance Zs in thin films of the superconducting MgB2 compound. Samples were prepared by e-beam evaporation of boron on r-plane sapphire followed by an ex situ annealing in Mg vapour. Critical temperature values range between 26 and 38 K. Surface impedance measurements (Zs = Rs + iXs) were performed from 2 K close to Tc in the microwave region up to 20 GHz via parallel plate or dielectrically loaded resonators in 'symmetric' (two MgB2 films) and asymmetric (an MgB2 film and a commercial YBCO control film) configurations. At high microwave power, frequency domain measurements show a characteristic signature associated with weak links and this appears to be the limiting factor governing the performance of these films.",

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T1 - A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB2 superconducting thin films

AU - Andreone, A.

AU - Di Gennaro, E.

AU - Lamura, G.

AU - Salluzzo, M.

AU - Purnell, A.

AU - Cohen, L. F.

AU - Hao, L.

AU - Gallop, J.

AU - Cantoni, C.

AU - Paranthaman, M.

PY - 2003/2

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AB - We present a study on the temperature and field dependence of the microwave surface impedance Zs in thin films of the superconducting MgB2 compound. Samples were prepared by e-beam evaporation of boron on r-plane sapphire followed by an ex situ annealing in Mg vapour. Critical temperature values range between 26 and 38 K. Surface impedance measurements (Zs = Rs + iXs) were performed from 2 K close to Tc in the microwave region up to 20 GHz via parallel plate or dielectrically loaded resonators in 'symmetric' (two MgB2 films) and asymmetric (an MgB2 film and a commercial YBCO control film) configurations. At high microwave power, frequency domain measurements show a characteristic signature associated with weak links and this appears to be the limiting factor governing the performance of these films.

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A study on the nonlinear microwave electrodynamic response of e-beam evaporated MgB₂ superconducting thin films

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