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

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Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields. / Kharel, A. P.; Soon, K. H.; Powell, J. R.; Porch, A.; Lancaster, M. J.; Velichko, A. V.; Humphreys, R. G.

In: IEEE Transactions on Applied Superconductivity, Vol. 9, No. 2 PART 2, 01.12.1999, p. 2121-2124.

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@article{70cfc3388b9a41e8b7e68b34e09cd152,
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.",
author = "Kharel, {A. P.} and Soon, {K. H.} and Powell, {J. R.} and A. Porch and Lancaster, {M. J.} and Velichko, {A. V.} and Humphreys, {R. G.}",
year = "1999",
month = dec,
day = "1",
doi = "10.1109/77.784886",
language = "English",
volume = "9",
pages = "2121--2124",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers (IEEE)",
number = "2 PART 2",

}

RIS

TY - JOUR

T1 - Non-linear microwave surface impedance of epitaxial HTS thin films in low DC magnetic fields

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.

UR - http://www.scopus.com/inward/record.url?scp=0032677595&partnerID=8YFLogxK

U2 - 10.1109/77.784886

DO - 10.1109/77.784886

M3 - Article

AN - SCOPUS:0032677595

VL - 9

SP - 2121

EP - 2124

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 2 PART 2

ER -