Normal-Mode Splitting in the Coupled System of Hybridized Nuclear Magnons and Microwave Photons

L. v. V Abdurakhimov (1) , Yu. M. Bunkov (2) , D. Konstantinov (1)

1 OIST - Okinawa Institute of Science and Technology Graduate University
2 NEEL - HELFA - Hélium : du fondamental aux applications

In the weak ferromagnetic MnCO3 system, a low-frequency collective spin excitation (magnon) is the hybridized oscillation of nuclear and electron spins coupled through the hyperfine interaction. By using a split-ring resonator, we performed transmission spectroscopy measurements of MnCO3 system and observed, for the first time, avoided crossing between the hybridized nuclear magnon mode and the resonator mode in the NMR-frequency range. The splitting strength is quite large due to the large spin density of 55 Mn, and the cooperativity value C = 0.2 (magnon-photon coupling parameter) is close to the conditions of strong coupling. The results reveal a new class of spin systems, in which the coupling between nuclear spins and photons is mediated by electron spins via the hyperfine interaction, and in which the similar normal-mode splitting of the hybridized nuclear magnon mode and the resonator mode can be observed.

Domaines: Matière Condensée [cond-mat]

L. v. V Abdurakhimov, Yu. M. Bunkov, D. Konstantinov. Normal-Mode Splitting in the Coupled System of Hybridized Nuclear Magnons and Microwave Photons. Physical Review Letters, 2015, 114 (22), pp.226402. ⟨10.1103/PhysRevLett.114.226402⟩. ⟨hal-01859485⟩