Observing electron spin resonance between 0.1 and 67 GHz at temperatures between 50 mK and 300 K using broadband metallic coplanar waveguides

Abstract

We describe a fully broadband approach for electron spin resonance (ESR) experiments where it is possible to not only tune the magnetic field but also the frequency continuously over wide ranges. Here a metallic coplanar transmission line acts as compact and versatile microwave probe that can easily be implemented in different cryogenic setups. We perform ESR measurements at frequencies between 0.1 and 67 GHz and at temperatures between 50 mK and room temperature. Three different types of samples (Cr3+ ions in ruby, organic radicals of the nitronyl-nitroxide family, and the doped semiconductor Si:P) represent different possible fields of application for the technique. We demonstrate that an extremely large phase space in temperature, magnetic field, and frequency for ESR measurements, substantially exceeding the range of conventional ESR setups, is accessible with metallic coplanar lines.

6 pages, 5 figures

References in corpus (3)

• Relevance of ferromagnetic correlations for the Electron Spin Resonance in Kondo lattice systems
• Microwave spectroscopy on heavy-fermion systems: probing the dynamics of charges and magnetic moments
• Signature of Electronic Correlations in the Optical Conductivity of the Doped Semiconductor Si:P

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• Cryogenic frequency-domain electron spin resonance spectrometer based on coplanar waveguides and field modulation
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• Electrically detected paramagnetic resonance in Ag-paint coated DPPH