Chin. Phys. Lett.  2014, Vol. 31 Issue (06): 067402    DOI: 10.1088/0256-307X/31/6/067402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Anomalous Temperature Dependence of the Quality Factor in a Superconducting Coplanar Waveguide Resonator
ZHOU Pin-Jia1, WANG Yi-Wen1, WEI Lian-Fu1,2**
1Quantum Optoelectronics Laboratory, School of Physics, Southwest Jiaotong University, Chengdu 610031
2State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275
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Abstract We present the measurements of the temperature dependence of the internal quality factor (Qi) of a microwave resonator, well below the superconducting transition temperature. The device is a quarter-wavelength niobium (Tc=9.2 K) coplanar waveguide resonator. The measured |S21| parameter shows typically the skewed Lorentzian distributions, from which the fitted quality factor monotonically decreases with the temperature increasing from 30 mK to 900 mK. It is observed that for the lower temperature range (i.e., at T<700 mK) the temperature dependence of the fitted Qi deviates significantly from the predictions of the usual Mattis–Bardeen theory. The measured 3 dB internal quality factor Q'i also verifies such an anomalous temperature dependence. Physically, this phenomenon could be attributed dominantly to the effects of the two-level systems in the device, rather than the usual temperature-dependent complex conductance.
Published: 26 May 2014
PACS:  74.78.-w (Superconducting films and low-dimensional structures)  
  81.16.Nd (Micro- and nanolithography)  
  84.40.Az (Waveguides, transmission lines, striplines)  
  85.25.-j (Superconducting devices)  
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ZHOU Pin-Jia, WANG Yi-Wen, WEI Lian-Fu 2014 Chin. Phys. Lett. 31 067402
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http://cpl.iphy.ac.cn/10.1088/0256-307X/31/6/067402       OR      http://cpl.iphy.ac.cn/Y2014/V31/I06/067402
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ZHOU Pin-Jia
WANG Yi-Wen
WEI Lian-Fu
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