Temperature-activated transition of positronium from self-trapped to delocalized state in Ca F2

K. Inoue, N. Suzuki, I. V. Bondarev, T. Hyodo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Temperature dependence of the momentum distribution of positronium (Ps) in Ca F2 single crystal has been investigated in a temperature range from 10 to 297 K. Temperature activated transition of Ps from the stable self-trapped state to the metastable delocalized state has been observed. The self-trapping barrier height and the under-barrier tunnel self-trapping rate have been determined to be 0.17 eV and 2.9× 1010 s-1, respectively, and an important role of the under-barrier tunneling has been demonstrated. The bottom of the delocalized Ps band is 6.6 meV higher in energy than the ground self-trapped state. The observed effective mass of the delocalized Ps is considerably larger than the free Ps mass in vacuum.

Original languageEnglish
Article number024304
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number2
DOIs
Publication statusPublished - 2007 Jul 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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