The physical nature and concentration of paramagnetic point defects in the dielectrics of superconducting planar microwave resonators have been determined using in-situ electron paramagnetic resonance spectroscopy. To perform this work, the quality factor of parallel plate and stripline resonators was measured as a function of the magnitude of a magnetic-field applied parallel to the electrode surfaces. YBa2Cu3O7−δ thin film electrodes proved to be a preferred choice over Nb and MgB2 because they are readily available and have a small surface resistance (Rs) up to high temperatures (∼77 K) and magnetic fields (i.e., <1 T). Stripline resonators with a widely used high performance microwave dielectric, Co2+-doped Ba(Zn1/3Nb2/3)O3, are shown to have losses dominated by d-electron spin-excitations in exchange-coupled Co2+ point-defect clusters, even in the absence of an applied magnetic field. A significant enhanced microwave loss in stripline and parallel plate resonators is found to correlate with the presence of paramagnetic Mn2+ dopants in Ba(Zn1/3Ta2/3)O3 ceramics and dangling bond states in amorphous Si thin films, although the identification of the dominant loss mechanism(s) in these dielectrics requires further investigation.
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19 September 2016
Research Article|
September 21 2016
In-situ electron paramagnetic resonance studies of paramagnetic point defects in superconducting microwave resonators
Shengke Zhang;
Shengke Zhang
1Materials Program,
Arizona State University
, Tempe, Arizona 85287, USA
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Cameron Kopas;
Cameron Kopas
1Materials Program,
Arizona State University
, Tempe, Arizona 85287, USA
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Brian Wagner;
Brian Wagner
2
Northrop Grumman Corporation
, Mission Systems, Linthicum, Maryland 21090, USA
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Daniel Queen;
Daniel Queen
2
Northrop Grumman Corporation
, Mission Systems, Linthicum, Maryland 21090, USA
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N. Newman
N. Newman
1Materials Program,
Arizona State University
, Tempe, Arizona 85287, USA
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Shengke Zhang
1
Cameron Kopas
1
Brian Wagner
2
Daniel Queen
2
N. Newman
1
1Materials Program,
Arizona State University
, Tempe, Arizona 85287, USA
2
Northrop Grumman Corporation
, Mission Systems, Linthicum, Maryland 21090, USA
Appl. Phys. Lett. 109, 122602 (2016)
Article history
Received:
July 26 2016
Accepted:
September 05 2016
Citation
Shengke Zhang, Cameron Kopas, Brian Wagner, Daniel Queen, N. Newman; In-situ electron paramagnetic resonance studies of paramagnetic point defects in superconducting microwave resonators. Appl. Phys. Lett. 19 September 2016; 109 (12): 122602. https://doi.org/10.1063/1.4962953
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