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Features of the Coupled Nuclear–Electron Spin Precession in the Bose–Einstein Condensate of Magnons

2020; Pleiades Publishing; Volume: 112; Issue: 2 Linguagem: Inglês

10.1134/s0021364020140076

1090-6487

Yu. M. Bunkov, Denis Konstantinov,

Quantum and electron transport phenomena

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.