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Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples | | P.J. Turner
; D.M. Broun
; Saeid Kamal
; M.E. Hayden
; J.S. Bobowski
; R. Harris
; D.C. Morgan
; J.S. Preston
; D.A. Bonn
; W.N. Hardy
; | | Date: |
15 Jul 2003 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | 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 non-resonant 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 instrument’s sensitivity 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 $approx$1 $muOmega$ for a typical 1 mm$ imes$1 mm platelet sample. | | Source: | arXiv, cond-mat/0307340 | | Services: | Forum | Review | PDF | Favorites | |
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