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Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet

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arxiv 1703.06202 v2 pith:BBRQN4LR submitted 2017-03-17 cond-mat.mes-hall quant-ph

Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet

M. Mergenthaler , J. Liu , J. J. Le Roy , N. Ares , A. L. Thompson , L. Bogani , F. Luis , S. J. Blundell
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T. Lancaster A. Ardavan G. A. D. Briggs P. J. Leek E. A. Laird
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classification cond-mat.mes-hall quant-ph
keywords circuitcouplingcrystaltemperatureantiferromagneticarchitecturecorrelationsmicrowave
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Coupling between a crystal of di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium radicals and a superconducting microwave resonator is investigated in a circuit quantum electrodynamics (circuit QED) architecture. The crystal exhibits paramagnetic behavior above 4~K, with antiferromagnetic correlations appearing below this temperature, and we demonstrate strong coupling at base temperature. The magnetic resonance acquires a field angle dependence as the crystal is cooled down, indicating anisotropy of the exchange interactions. These results show that multispin modes in organic crystals are suitable for circuit QED, offering a platform for their coherent manipulation. They also utilize the circuit QED architecture as a way to probe spin correlations at low temperature.

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