Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields

Anton Velichko; Adrian Porch; Michael Lancaster; Richard Humphreys

doi:10.1109/77.919817

Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields

Anton Velichko, Adrian Porch, Michael Lancaster, Richard Humphreys

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8 Citations (Scopus)

Abstract

Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit In anomalous decrease in their surface impedance Z(s) as a function of microwave field H-rf. In zero de field, H-rf-dependences of R-s and X, for both the samples are uncorrelated, and only one of the quantities, R, or X, displays anomalous behavior. Here, application of relatively weak (similar to5 mT) de magnetic fields H-dc can produce a correlated decrease of R-x(H-rf) and X-s(H-rf). The dependences of Z(s) on H-dc in both low and high microwave power regimes were found to be non;monotonic. The frequency dependence of R-s similar to f(n), 1.7

Original language	English
Pages (from-to)	3497-3500
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
DOIs	https://doi.org/10.1109/77.919817
Publication status	Published - 1 Mar 2001

Keywords

anomalous effects
power-handling capability
nonlinear microwave surface impedance
YBaCuO thin films

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10.1109/77.919817

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title = "Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields",

abstract = "Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit In anomalous decrease in their surface impedance Z(s) as a function of microwave field H-rf. In zero de field, H-rf-dependences of R-s and X, for both the samples are uncorrelated, and only one of the quantities, R, or X, displays anomalous behavior. Here, application of relatively weak (similar to5 mT) de magnetic fields H-dc can produce a correlated decrease of R-x(H-rf) and X-s(H-rf). The dependences of Z(s) on H-dc in both low and high microwave power regimes were found to be non;monotonic. The frequency dependence of R-s similar to f(n), 1.7 ",

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AU - Velichko, Anton

AU - Porch, Adrian

AU - Lancaster, Michael

AU - Humphreys, Richard

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Y1 - 2001/3/1

N2 - Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit In anomalous decrease in their surface impedance Z(s) as a function of microwave field H-rf. In zero de field, H-rf-dependences of R-s and X, for both the samples are uncorrelated, and only one of the quantities, R, or X, displays anomalous behavior. Here, application of relatively weak (similar to5 mT) de magnetic fields H-dc can produce a correlated decrease of R-x(H-rf) and X-s(H-rf). The dependences of Z(s) on H-dc in both low and high microwave power regimes were found to be non;monotonic. The frequency dependence of R-s similar to f(n), 1.7

AB - Two high-quality Y-Ba-Cu-O thin films on MgO substrates have been investigated using the coplanar resonator technique at 8 and 16 GHz. Both films exhibit In anomalous decrease in their surface impedance Z(s) as a function of microwave field H-rf. In zero de field, H-rf-dependences of R-s and X, for both the samples are uncorrelated, and only one of the quantities, R, or X, displays anomalous behavior. Here, application of relatively weak (similar to5 mT) de magnetic fields H-dc can produce a correlated decrease of R-x(H-rf) and X-s(H-rf). The dependences of Z(s) on H-dc in both low and high microwave power regimes were found to be non;monotonic. The frequency dependence of R-s similar to f(n), 1.7

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KW - nonlinear microwave surface impedance

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Anomalous Features in Surface Impedance of Y-Ba-Cu-O Thin Films: Dependence on Frequency, RF and DC Fields

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Keywords

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