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9 Jul 2012

Volume 101, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 101, 023101 (2012); http://dx.doi.org/10.1063/1.4731792 (4 pages)

Feng Wang, Ayan Chakrabarty, Fred Minkowski, Kai Sun, and Qi-Huo Wei
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Identifying capacitive and inductive loss in lumped element superconducting hybrid titanium nitride/aluminum resonators

Michael R. Vissers, Martin P. Weides, Jeffrey S. Kline, Martin Sandberg, and David P. Pappas

Appl. Phys. Lett. 101, 022601 (2012); http://dx.doi.org/10.1063/1.4730389 (5 pages) | Cited 3 times

Online Publication Date: 9 July 2012

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We present a method to systematically locate and extract capacitive and inductive losses in superconducting resonators at microwave frequencies by use of mixed-material, lumped element devices. In these devices, ultra-low loss titanium nitride was progressively replaced with aluminum in the inter-digitated capacitor and meandered inductor elements. By measuring the power dependent loss at 50 mK as the Al/TiN fraction in each element is increased, we find that at low electric field, i.e., in the single photon limit, the loss is two level system in nature and is correlated with the amount of Al capacitance rather than the Al inductance. In the high electric field limit, the remaining loss is linearly related to the product of the Al area times its inductance and is likely due to quasiparticles generated by stray IR radiation. At elevated temperature, additional loss is correlated with the amount of Al in the inductance, with a power independent TiN-Al interface loss term that exponentially decreases as the temperature is reduced. The TiN-Al interface loss is vanishingly small at the 50 mK base temperature.
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85.25.-j Superconducting devices
84.32.Tt Capacitors

Nonlinear induction detection of electron spin resonance

Gil Bachar, Oren Suchoi, Oleg Shtempluck, Aharon Blank, and Eyal Buks

Appl. Phys. Lett. 101, 022602 (2012); http://dx.doi.org/10.1063/1.4734500 (4 pages)

Online Publication Date: 12 July 2012

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We present an approach to the induction detection of electron spin resonance (ESR) signals exploiting the nonlinear properties of a superconducting resonator. Our experiments employ a yttrium barium copper oxide superconducting stripline microwave (MW) resonator integrated with a microbridge. A strong nonlinear response of the resonator is thermally activated in the microbridge when exceeding a threshold in the injected MW power. The responsivity factor characterizing the ESR-induced change in the system’s output signal is about 100 times larger when operating the resonator near the instability threshold, compared to the value obtained in the linear regime of operation. Preliminary experimental results, together with a theoretical model of this phenomenon are presented. Under appropriate conditions, nonlinear induction detection of ESR can potentially improve upon the current capabilities of conventional linear induction detection ESR.
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76.30.-v Electron paramagnetic resonance and relaxation
85.25.-j Superconducting devices
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