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

Mergenthaler, Matthias and Liu, Junjie and Le Roy, Jennifer J. and Ares, Natalia and Thompson, Amber L. and Bogani, Lapo and Luis, Fernando and Blundell, Stephen J. and Lancaster, Tom and Ardavan, Arzhang and Briggs, G. Andrew D. and Leek, Peter J. and Laird, Edward A. (2017) 'Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet.', Physical review letters., 119 (14). p. 147701.


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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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review Letters 119, 147701 © 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:07 August 2017
Date deposited:09 October 2017
Date of first online publication:02 October 2017
Date first made open access:09 October 2017

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