Muonium dynamics in transparent conducting oxides

Celebi Y. G., Lichti R. L., Baker B. B., Mengyan P. W., Bani-Salameh H. N., Catak E.

PHYSICA B-CONDENSED MATTER, vol.407, no.15, pp.2879-2882, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 407 Issue: 15
  • Publication Date: 2012
  • Doi Number: 10.1016/j.physb.2011.08.045
  • Journal Name: PHYSICA B-CONDENSED MATTER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2879-2882
  • Istanbul University Affiliated: Yes

Abstract

The motional and electrical properties of positively charged muonium (Mu(+)) centers in single crystal beta-Ga2O3 are investigated via zero field muon spin relaxation (ZF-MuSR). Below room temperature we find two distinct shallow muonium centers with ionization energies of 7 and 16 meV. Above room temperature, at least three different Mu(+) signals are resolved; two of these are metastable while the third shows characteristics of a stable ground state. As the temperature is elevated, metastable centers undergo several transitions. We obtain the relevant barrier energies associated with these site-change transitions. By 700 K, most muons occupy the mobile ground state, and an activation energy of about 1.65 eV is inferred for Mu(+) diffusion from the hop rates obtained for this state. (C) 2011 Elsevier B.V. All rights reserved.