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Phys. Rev. B 72, 012303 (2005) [4 pages]

Nonpolar optical scattering of positronium in magnesium fluoride

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I. V. Bondarev1,2,*, Y. Nagai3, M. Kakimoto4, and T. Hyodo5
1Institute for Nuclear Problems, Belarusian State University, Bobruiskaya Str. 11, 220050 Minsk, Belarus
2Laboratoire d’Annecy-le-Vieux de Physique des Particules, BP 110 74941 Annecy-le-Vieux Cédex, France
3Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan
4Communication and Information System Laboratories, R & D Center, Toshiba, 1 Komukai, Toshiba-Cho, Kawasaki, Kanagawa 212-8582, Japan
5Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan

Received 15 March 2005; published 14 July 2005

We report the results of the analysis of the temperature broadening of the momentum distribution of delocalized positronium (Ps) in magnesium fluoride in terms of the optical deformation-potential scattering model (long-wavelength optical phonons). The Ps optical deformation-potential coupling constant Do in MgF2 has been determined to be (1.8±0.3)×109 eV∕cm. We also show that the Ps momentum distribution is sensitive to second-order phase transitions in those crystals where optical deformation-potential scattering is allowed in one and forbidden in another crystalline phase.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.012303
DOI:
10.1103/PhysRevB.72.012303
PACS:
78.70.Bj, 71.38.−k, 71.60.+z

*Corresponding author. E-mail: bondarev@tut.by

 
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