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An apparatus for the measurement of the surface resistance of high temperature superconducting thin films Knobel, Robert
Abstract
An apparatus to measure the millimeter-wave surface resistance of thin films of high temperature superconductors has been built. The apparatus consists of a flow cryostat, an open resonator and a swept-frequency millimeter-wave source/detector pair. The flow cryostat is used to cool the experiment to cryogenic temperatures (either 2 K with liquid helium, or 70 K with liquid nitrogen), while keeping a very short distance between the experiment and room temperature. The cryogenic fluid is drawn through the cryostat, and circulates through heat exchangers, absorbing incident heat. The open resonator allows sensitive measurement of the surface resistance of the film at high frequency. The resonator built operates at 117 GHz, and has a Q for copper at 77 K of 39000. The millimeter-wave source and detector are taken from a fixed frequency apparatus, and were modified to provide a frequency sweep capability. The source and detector operate in a band between 116.8 and 117.6 GHz. Measurements were performed on both metallic and superconducting samples. The metallic samples were used as calibration of the geometric factors of the resonator, in order to extract the value of the surface resistance. Four thin films of high temperature superconductors were measured, as a demonstration of the capabilities of the apparatus.
Item Metadata
Title |
An apparatus for the measurement of the surface resistance of high temperature superconducting thin films
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1995
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Description |
An apparatus to measure the millimeter-wave surface resistance of thin films of high
temperature superconductors has been built. The apparatus consists of a flow cryostat,
an open resonator and a swept-frequency millimeter-wave source/detector pair.
The flow cryostat is used to cool the experiment to cryogenic temperatures (either 2
K with liquid helium, or 70 K with liquid nitrogen), while keeping a very short distance
between the experiment and room temperature. The cryogenic fluid is drawn through
the cryostat, and circulates through heat exchangers, absorbing incident heat.
The open resonator allows sensitive measurement of the surface resistance of the film
at high frequency. The resonator built operates at 117 GHz, and has a Q for copper at
77 K of 39000. The millimeter-wave source and detector are taken from a fixed frequency
apparatus, and were modified to provide a frequency sweep capability. The source and
detector operate in a band between 116.8 and 117.6 GHz.
Measurements were performed on both metallic and superconducting samples. The
metallic samples were used as calibration of the geometric factors of the resonator, in
order to extract the value of the surface resistance. Four thin films of high temperature
superconductors were measured, as a demonstration of the capabilities of the apparatus.
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Extent |
5274978 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-01-21
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0086926
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1995-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.