Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields

A. P. Kharel; K. H. Soon; J. R. Powell; A. Porch; M. J. Lancaster; A. V. Velichko; R. G. Humphreys

doi:10.1109/77.784886

Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields

A. P. Kharel^*, K. H. Soon, J. R. Powell, A. Porch, M. J. Lancaster, A. V. Velichko, R. G. Humphreys

^*Corresponding author for this work

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

14 Citations (Scopus)

Abstract

We have carried out non-linear microwave (8 GHz) surface impedance measurements of three YBaCuO thin films in dc magnetic fields Hdc (parallel to c axis) up to 12 mT using a coplanar resonator technique. In zero dc field the three films, deposited by the same method, show a spread of low-power residual surface resistance, Rrcs and penetration depth, A (T = 15 K) within a factor of 1.9. However, they exhibit dramatically different microwave field, Hr; dependences of the surface resistance, Rs, but universal Xs(Hr/) dependence. Application of a dc field was found to affect not only absolute values of R, and Xs, but the functional dependences R,(HTf] and X,(Hr/) as well. For some of the samples the dc field was found to decrease Ra below its zero-field low-power value.

Original language	English
Pages (from-to)	2121-2124
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	9
Issue number	2 PART 2
DOIs	https://doi.org/10.1109/77.784886
Publication status	Published - 1 Dec 1999

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields",

abstract = "We have carried out non-linear microwave (8 GHz) surface impedance measurements of three YBaCuO thin films in dc magnetic fields Hdc (parallel to c axis) up to 12 mT using a coplanar resonator technique. In zero dc field the three films, deposited by the same method, show a spread of low-power residual surface resistance, Rrcs and penetration depth, A (T = 15 K) within a factor of 1.9. However, they exhibit dramatically different microwave field, Hr; dependences of the surface resistance, Rs, but universal Xs(Hr/) dependence. Application of a dc field was found to affect not only absolute values of R, and Xs, but the functional dependences R,(HTf] and X,(Hr/) as well. For some of the samples the dc field was found to decrease Ra below its zero-field low-power value.",

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AU - Kharel, A. P.

AU - Soon, K. H.

AU - Powell, J. R.

AU - Porch, A.

AU - Lancaster, M. J.

AU - Velichko, A. V.

AU - Humphreys, R. G.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - We have carried out non-linear microwave (8 GHz) surface impedance measurements of three YBaCuO thin films in dc magnetic fields Hdc (parallel to c axis) up to 12 mT using a coplanar resonator technique. In zero dc field the three films, deposited by the same method, show a spread of low-power residual surface resistance, Rrcs and penetration depth, A (T = 15 K) within a factor of 1.9. However, they exhibit dramatically different microwave field, Hr; dependences of the surface resistance, Rs, but universal Xs(Hr/) dependence. Application of a dc field was found to affect not only absolute values of R, and Xs, but the functional dependences R,(HTf] and X,(Hr/) as well. For some of the samples the dc field was found to decrease Ra below its zero-field low-power value.

AB - We have carried out non-linear microwave (8 GHz) surface impedance measurements of three YBaCuO thin films in dc magnetic fields Hdc (parallel to c axis) up to 12 mT using a coplanar resonator technique. In zero dc field the three films, deposited by the same method, show a spread of low-power residual surface resistance, Rrcs and penetration depth, A (T = 15 K) within a factor of 1.9. However, they exhibit dramatically different microwave field, Hr; dependences of the surface resistance, Rs, but universal Xs(Hr/) dependence. Application of a dc field was found to affect not only absolute values of R, and Xs, but the functional dependences R,(HTf] and X,(Hr/) as well. For some of the samples the dc field was found to decrease Ra below its zero-field low-power value.

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Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields

Abstract

ASJC Scopus subject areas

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