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Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples

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10 Author(s)
Turner, P.J. ; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 ; Broun, D.M. ; Kamal, Saeid ; Hayden, M.E.
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A novel low-temperature bolometric method has been devised and implemented for high-precision measurements of the microwave surface resistance of small single-crystal platelet samples having very low absorption, as a continuous function of frequency. The key to the success of this nonresonant method is the in situ use of a normal metal reference sample that calibrates the absolute rf field strength. The sample temperature can be controlled independently of the 1.2 K liquid-helium bath, allowing for measurements of the temperature evolution of the absorption. However, the sensitivity of the instrument decreases at higher temperatures, placing a limit on the useful temperature range. Using this method, the minimum detectable power at 1.3 K is 1.5 pW, corresponding to a surface resistance sensitivity of ≈1 μΩ for a typical 1 mm×1 mm platelet sample. © 2004 American Institute of Physics.

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Review of Scientific Instruments  (Volume:75 ,  Issue: 1 )