Dielectric Relaxation by Quantum Critical Magnons,Physical Review Letters

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Dielectric Relaxation by Quantum Critical Magnons
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-26 , DOI: 10.1103/physrevlett.130.216501
Daniel Flavián ₁ , Pavel A Volkov _{2,

3,

4} , S Hayashida ₁ , K Yu Povarov ₁ , S Gvasaliya ₁ , Premala Chandra ₄ , A Zheludev ₁

Affiliation

We report the experimental observation of dielectric relaxation by quantum critical magnons. Complex capacitance measurements reveal a dissipative feature with a temperature-dependent amplitude due to low-energy lattice excitations and an activation behavior of the relaxation time. The activation energy softens close to a field-tuned magnetic quantum critical point at

H = H_{c}

and follows single-magnon energy for

H > H_{c}

, showing its magnetic origin. Our study demonstrates the electrical activity of coupled low-energy spin and lattice excitations, an example of quantum multiferroic behavior.

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