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On the theory of Bose-Einstein condensation of quasiparticles: on the possibility of condensation of magnons at high temperatures | | A.I. Bugrij
; V.M. Loktev
; | | Date: |
18 Jan 2007 | | Journal: | Low Temp. Phys. v.33, No 1 (January) (2007) | | Subject: | Statistical Mechanics | | Abstract: | Bose condensation of quasiparticles in physical systems of finite size iz considered for the case of ferromagnetic thin films. It is shown that in accordance with present-day experimental capabilities which permit one to achieve densities of long-wave spin excitation of 1018-1019 cm-3, in such films the formation of condensate of such quasiparticles begins at temperatures T~100 K (room one including). It is found that Bose condensation is accompanied by scaling phenomenon according to which the main thermodynamic variable is not the number N of particles but the ratio N/T. This indicates that condensation of magnons can be observed at relatively low magnon densities. The roles played by the shape of the spectrum and film thickness are analyzed. | | Source: | arXiv, cond-mat/0701437 | | Services: | Forum | Review | PDF | Favorites | |
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