Broadband electron spin resonance from 500 MHz to 40 GHz using superconducting coplanar waveguides

Abstract

We present non-conventional electron spin resonance (ESR) experiments using microfabricated superconducting waveguides. We show that a very broad frequency range, from 0.5 to 40 GHz, becomes accessible with a high frequency accuracy of less than 1 MHz at low temperatures down to 1.6 K and in fields up to 1.4 T. This allows an accurate inspection of the ESR absorption position in the frequency domain, in contrast to the more common observation in the field domain. We demonstrate the applicability of frequency-swept ESR on Cr3+ atoms in ruby as well as on organic radicals of the Nitronyl-nitroxide family (using the 2-(4'-methoxyphenyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide, a.k.a. NitPhOMe). Measurements between 1.6 and 30 K reveal a small frequency shift of the ESR and a resonance broadening below the critical temperature, which we both attribute to a modification of the magnetic field configuration due to the appearance of shielding currents.

References in corpus (1)

• Microwave response of vortices in superconducting thin films of Re and Al

Cited by in corpus (19)

• A scalable architecture for quantum computation with molecular nanomagnets
• Coupling single molecule magnets to quantum circuits
• Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet
• Coherently coupling distinct spin ensembles through a high-$T_c$ superconducting resonator
• Observing electron spin resonance between 0.1 and 67 GHz at temperatures between 50 mK and 300 K using broadband metallic coplanar waveguides
• Strong coupling of an Er3+ doped YAlO3 crystal to a superconducting resonator
• High precision measurement of the Dzyaloshinsky-Moriya interaction between two rare-earth ions in a solid
• Metallic coplanar resonators optimized for low-temperature measurements
• Electron Paramagnetic Resonance Spectroscopy of Er${}^{3+}$:Y${}_2$SiO${}_5$ Using Josephson Bifurcation Amplifier: Observation of Hyperfine and Quadrupole Structures
• 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 Pb stripline resonators in parallel magnetic field and their application for microwave spectroscopy
• Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonators
• Cryogenic frequency-domain electron spin resonance spectrometer based on coplanar waveguides and field modulation
• Optimization of Coplanar Waveguide Resonators for ESR Studies on Metals
• Broadband electron paramagnetic resonance spectroscopy of ${}^{167}$Er:${}^7$LiYF${}_4$ at mK temperatures
• Angle-dependent electron spin resonance of YbRh${}_2$Si${}_2$ measured with planar microwave resonators and in-situ rotation
• Waveguide quantum electrodynamics at the onset of spin-spin correlations
• Instrument for in-situ orientation of superconducting thin-film resonators used for electron-spin resonance experiments