Metallic coplanar resonators optimized for low-temperature measurements. (8th September 2016)

• Record Type: Journal Article
• Authors: Javaheri Rahim, Mojtaba; Lehleiter, Thomas; Bothner, Daniel; Krellner, Cornelius; Koelle, Dieter; Kleiner, Reinhold; Dressel, Martin; Scheffler, Marc
• Is Part Of: Journal of physics. Volume 49:Number 39(2016)
• Publication Date: 2016-09-08
• Subjects: microwave spectroscopy -- coplanar resonators -- low temperature electron spin resonance; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/39/395501
• Languages: English
• ISSNs: 0022-3727

Abstract

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 (20–100 µ m) and coupling gap size (10–50 µ m), 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.