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Journal of Low Temperature Physics

Magnon BEC in Antiferromagnets with Suhl–Nakamura Interaction

Murat S. Tagirov, Egor M. Alakshin, Yu. M. Bunkov, R. R. Gazizulin, A. M. Gazizulina, L. I. Isaenko, Alexander V. Klochkov, T. R. Safin, K. R. Safiullin, Sergey Alexandrovich Zhurkov

Published Jan 13, 2014• 17 citations
Publisher
DOI
10.1007/s10909-013-1085-1

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The Bose–Einstein condensation (BEC) corresponds to the formation of a collective quantum state in which macroscopic number of particles is governed by a single wave function. The magnon BEC forms by excited non-equilibrium magnons and manifests itself by coherent precession of magnetization even in an inhomogeneous magnetic field. The magnon BEC is very similar to an atomic BEC, but the potential of the interaction between magnons may variate very significantly. The superfluid phases of 3He are the best antiferromagnetic system for investigations of magnon BEC and spin superfluidity. The 6 different states of magon BEC were observed in 3He. Recently magnon BEC was observed in antiferromagnets with Suhl–Nakamura interaction and ferrites. Here we review for the first time the switch off NMR method, when magnon BEC forms during a long radiofrequency pulse. The new experimental results are discussed.