Add time:08/21/2019         Source:sciencedirect.com

We study electron spin resonance (ESR) of DPPH at mK temperatures. Here we employ a superconducting coplanar microwave resonator that allows convenient implementation in a dilution refrigerator as well as operation at multiple ESR frequencies, in this case 1.5 GHz, 3.0 GHz, and 4.5 GHz. We find a strong temperature and magnetic field dependence of the ESR of DPPH below 1 K, which is consistent with an antiferromagnetic transition. Our study documents the potential of this on-chip ESR technique for mK experiments and elucidates the possibility to use DPPH as an ESR reference material in this regime.

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