Abstract
The experimental detection of the Bose-Einstein condensate of magnons in coupled nuclear-electron spin precession in antiferromagnets brings the prospect of its use for magnonics and computer calculations. In particular, an attractive feature of such systems is a relatively large spin coherence time compared to traditional iron yttrium garnet samples. However, the observed Bose-Einstein condensation of magnons contradicts the Suhl-Nakamura model and the Bloch equations, which are usually used for these systems. The results of a direct experiment in antiferromagnetic MnCO3 performed in this work indicate that the Suhl-Nakamura model and the Bloch equations cannot adequately describe the coupled nuclear-electron spin motion at large levels of magnon excitation.
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Funding
This work was supported by the Russian Science Foundation, project no. 19-12-00397. The experimental part of the work was performed at the Laboratory of Quantum Dynamics, supported by the Okinawa Institute of Science and Technology (OIST) Graduate University.
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 2, pp. 101–106.
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Bunkov, Y.M., Konstantinov, D. Features of the Coupled Nuclear–Electron Spin Precession in the Bose–Einstein Condensate of Magnons. Jetp Lett. 112, 95–100 (2020). https://doi.org/10.1134/S0021364020140076
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DOI: https://doi.org/10.1134/S0021364020140076