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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Mergenthaler, Matthias, Liu, Junjie, Le Roy, Jennifer J., Ares, Natalia, Thompson, Amber L., Bogani, Lapo, Luis, Fernando, Blundell, Stephen J., Lancaster, Tom, Ardavan, Arzhang, Briggs, G. Andrew D., Leek, Peter J. & Laird, Edward A. (2017). Strong Coupling of Microwave Photons to Antiferromagnetic Fluctuations in an Organic Magnet. Physical Review Letters 119(14): 147701.

Author(s) from Durham


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.