An anomalous low-field increase in the resonant frequency of ultra-thin TiN resonators is explained by a spin-flip two-level system model in which magnetic defects mix charge tunneling and spin flips.
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Revealing spin-flip two-level systems using ultra-thin film superconducting resonators
An anomalous low-field increase in the resonant frequency of ultra-thin TiN resonators is explained by a spin-flip two-level system model in which magnetic defects mix charge tunneling and spin flips.