Metallic coplanar resonators optimized for low-temperature measurements

Abstract

Metallic coplanar microwave resonators are widely employed at room temperature, but their low-temperature performance has received little attention so far. We characterize compact copper coplanar resonators with multiple modes from 2.5 to 20 GHz at temperatures as low as 5 K. We investigate the influence of center conductor width (20 to 100 μm) and coupling gap size (10 to 50 μm), and we observe a strong increase of quality factor (Q) for wider center conductors, reaching values up to 470. The magnetic-field dependence of the resonators is weak, with a maximum change in Q of 3.5% for an applied field of 7 T. This makes these metallic resonators well suitable for magnetic resonance studies, as we document with electron spin resonance (ESR) measurements at multiple resonance frequencies.

6 pages, 5 figures

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Cited by in corpus (13)

• Gapped magnetic ground state in quantum-spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$-Cu${}_2$(CN)${}_3$
• Improving superconducting resonators in magnetic fields by reduced field-focussing and engineered flux screening
• Superconducting coplanar microwave resonators with operating frequencies up to 50 GHz
• Superconducting boron doped nanocrystalline diamond microwave coplanar resonator
• Cryogenic frequency-domain electron spin resonance spectrometer based on coplanar waveguides and field modulation
• Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators
• Development of planar microstrip resonators for electron spin resonance spectroscopy
• Angle-dependent electron spin resonance of YbRh${}_2$Si${}_2$ measured with planar microwave resonators and in-situ rotation
• Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators
• Microwave probing of bulk dielectrics using superconducting coplanar resonators in distant-flip-chip geometry
• Contact-less characterizations of encapsulated graphene p-n junctions
• Detection of electron spin resonance down to 10 K using localized spoof surface plasmon
• S-band electron spin resonance spectroscopy using a short-circuited coplanar waveguide resonator