Magnon Kinetics and Bose-Einstein Condensation Studied in Phase Space

V. E. Demidov, O. Dzyapko, M. Buchmeier, T. Stockhoff, G. Schmitz, G. A. Melkov, and S. O. Demokritov

Phys. Rev. Lett. 101, 257201 – Published 18 December 2008

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.

Received 8 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.257201

Authors & Affiliations

V. E. Demidov^1,*, O. Dzyapko¹, M. Buchmeier¹, T. Stockhoff², G. Schmitz², G. A. Melkov³, and S. O. Demokritov¹

¹Institute for Applied Physics, University of Münster, 48149 Münster, Germany
²Institute of Material Physics, University of Münster, 48149 Münster, Germany
³Department of Radiophysics, National Taras Schevchenko University of Kiev, Kiev, Ukraine

^*Corresponding author. demidov@uni-muenster.de On leave from St. Petersburg Electrotechnical University, St. Petersburg, Russia.

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Vol. 101, Iss. 25 — 19 December 2008

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