Temperature dependence of the momentum distribution of positronium in MgF2, SiO2, and H2O

Y. Nagai, M. Kakimoto, T. Hyodo, K. Fujiwara, H. Ikari, M. Eldrup, A. T. Stewart

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Temperature dependence of the momentum distribution of delocalized Bloch-positronium in solids is studied. The momentum distribution of the positronium, which is proportional to the energy integration of the spectral function weighted with the Bose distribution, is expressed in terms of the effective mass and the deformation potential of the crystal for positronium. A simple formula for the shape of the positronium peak in the 1D-ACAR spectrum is derived and applied to the analysis of the experimental data for MgF2, SiO2, and H2O in wide temperature ranges. An extraordinary broadening of the peak shape is observed for MgF2. It is interpreted as an effect of the umklapp phonon scattering. The diffusion constants of Ps in these materials are also estimated.

Original languageEnglish
Pages (from-to)5531-5535
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2000 Sep 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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