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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Other Low Temperature Topics: Poster Session

TT 22.2: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Metallic Coplanar Microwave Resonators for Cryogenic Applications — •Mojtaba Javaheri1, Conrad Clauss1, Daniel Bothner2, Dieter Koelle2, Reinhold Kleiner2, Martin Dressel1, and Marc Scheffler111. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany — 2Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, Tübingen, Germany

Microwave (MW) spectroscopy based on resonator measurements can reveal important information about charge and spin dynamics in solids. Recently superconducting coplanar resonators, which are commonly used in quantum information science, have successfully been compatibilized and applied for cryogenic magnetic resonance studies. However, they feature certain disadvantages arising from the magnetic-field dependence of the superconductivity and also diamagnetic field repulsions. To avoid this, we now study metallic (non-superconducting) coplanar resonators as an alternative approach for applications at cryogenic temperatures and finite magnetic fields.

We have prepared coplanar MW resonators made of either copper or gold (thin) films with various geometrical specifications. Their MW performance in the frequency range of 1 GHz to 18 GHz and at temperatures between 5 K and 300 K are measured. We find the temperature dependence of the resonator quality factor corresponds to the dc conductivity. We present some strategies to optimize the MW properties of the metallic films and the actual resonator device. The results are compared to some previous studies on superconducting resonators.

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