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Hyperfine spectroscopy in a quantum-limited spectrometer

Abstract : We report measurements of electron-spin-echo envelope modulation (ESEEM) performed at millikelvin temperatures in a custom-built high-sensitivity spectrometer based on superconducting micro-resonators. The high quality factor and small mode volume (down to 0.2 pL) of the resonator allow us to probe a small number of spins, down to 5×102. We measure two-pulse ESEEM on two systems: erbium ions coupled to 183W nuclei in a natural-abundance CaWO4 crystal and bismuth donors coupled to residual 29Si nuclei in a silicon substrate that was isotopically enriched in the 28Si isotope. We also measure three- and five-pulse ESEEM for the bismuth donors in silicon. Quantitative agreement is obtained for both the hyperfine coupling strength of proximal nuclei and the nuclear-spin concentration.
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Submitted on : Wednesday, January 20, 2021 - 12:38:53 PM
Last modification on : Wednesday, August 24, 2022 - 10:36:42 AM

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Sebastian Probst, Gengli Zhang, Miloš Rančić, Vishal Ranjan, Marianne Le Dantec, et al.. Hyperfine spectroscopy in a quantum-limited spectrometer. Magnetic Resonance, 2020, 1 (2), pp.315-330. ⟨10.5194/mr-1-315-2020⟩. ⟨cea-03116462⟩



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