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, cilt.407, sa.15, ss.2879-2882, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 407 Konu: 15
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1016/j.physb.2011.08.045
  • Sayfa Sayıları: ss.2879-2882


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.