Thumbnail
Access Restriction
Open

Author Eagles, D. M. ♦ Georgiev, M. ♦ Petrova, P. C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ STRONTIUM TITANATES ♦ SOLID-STATE PLASMA ♦ NIOBIUM ADDITIONS ♦ LANGMUIR FREQUENCY ♦ POLARONS ♦ ELECTRON-PHONON COUPLING ♦ TEMPERATURE DEPENDENCE
Abstract A theory of mixed polarons is used to interpret the published experimental results of Gervais {ital et} {ital al}. on temperature-dependent plasma frequencies in Nb-doped SrTiO{sub 3}. For given polaron masses before mixing, the appropriate average mixed-polaron mass at any temperature {ital T} depends on two quantities, {delta} and {ital b}, which are measures of the separation between the bottoms of large and nearly small polaron bands before mixing and of a mixing matrix element; {delta} and {ital b} are assumed to have arbitrary linear dependences on {ital T}, probably related to a {ital T} dependence of the bare mass, and a term quadratic in {ital T} is included in {delta}, determined from the {ital T} dependence of large-polaron binding energies. Including a constraint on the ratio {delta}/{vert_bar}{ital b}{vert_bar} at low {ital T} from known masses from specific-heat data, satisfactory agreement is obtained with masses determined from plasma frequencies. This gives further support for the theory of mixed polarons in SrTiO{sub 3} in addition to that already published. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-07-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 1


Open content in new tab

   Open content in new tab