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Magnon Kinetics and Bose-Einstein Condensation Studied in Phase Space

by: V. E. Demidov, O. Dzyapko, M. Buchmeier, T. Stockhoff, G. Schmitz, G. A. Melkov, S. O. Demokritov
Physical Review Letters, Vol. 101 (Dec 2008), 257201, doi:10.1103/physrevlett.101.257201  Key: citeulike:12040571

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Abstract

Using a novel technique providing simultaneous resolution with respect to the wave vector and frequency of magnons, we observed the formation of a Bose-Einstein condensate documented by the narrowing of the magnon distribution in phase space. Based on the measured width of the distribution we determined the effective correlation length of the condensate, which appears to be anisotropic, reflecting the anisotropy of the magnon dispersion spectrum.


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