Nonpolar optical scattering of positronium in magnesium fluoride

I. V. Bondarev; Y. Nagai; M. Kakimoto; T. Hyodo

doi:10.1103/PhysRevB.72.012303

Nonpolar optical scattering of positronium in magnesium fluoride

I. V. Bondarev, Y. Nagai, M. Kakimoto, T. Hyodo

IMR - Materials Design Division

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Abstract

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 eVcm. 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.

Original language	English
Article number	012303
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.72.012303
Publication status	Published - 2005

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10.1103/PhysRevB.72.012303

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AU - Bondarev, I. V.

AU - Nagai, Y.

AU - Kakimoto, M.

AU - Hyodo, T.

PY - 2005

Y1 - 2005

N2 - 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 eVcm. 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.

AB - 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 eVcm. 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.

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JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

Nonpolar optical scattering of positronium in magnesium fluoride

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