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Magnonic Superfluidity Versus Bose Condensation

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Abstract

This article discusses two different coherent quantum phenomena of magnonic bosons: Bose–Einstein condensation (mBEC) and Superfluid State of Magnons (SSM). What is the difference between the two? Magnon BEC is a quantum phenomenon determined by local density of bosonic quasiparticles. The superfluid state of magnons is a long-range coherent quantum state characterized by the rigidity of the order parameter. This is similar to the states of mass superfluidity and superconductivity. In this state, the deflected magnetization can coherently precess even in a strongly inhomogeneous magnetic field. The magnons superflow restore the coherence of SSM after a perturbation. The critical Landau velocity of the coherent magnon flow is determined by an energy gap arising from the repulsion of magnons. This article describes in detail the mechanism of SSM formation.

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Acknowledgements

The authors wish to thank G. E. Volovik, V. P. Mineev, V. L’vov and O. A. Serga for helpful comments and O. Demokritov for stimulating discussions. Financial support by the Russian Science Foundation within the Grant 19-12-00397 “Spin Superfluids” is gratefully acknowledged.

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  1. Russian Quantum Center, Skolkovo, 143025, Moscow, Russia

    Yury Bunkov

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Bunkov, Y. Magnonic Superfluidity Versus Bose Condensation. Appl Magn Reson 51, 1711–1721 (2020). https://doi.org/10.1007/s00723-020-01223-z

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