title: Electron localization in a disordered insulating host
abstract: Transport of excess electrons has been studied in solid N2-Ar mixtures between 5 and 60 K using muon spin rotation in magnetic and electric fields. At low temperatures, orientational frustration of N2 molecular quadrupoles by a sufficiently high concentration of Ar atoms leads to formation of a quadrupolar glass phase in which electrons are found to be strongly localized. This feature is in marked contrast to the electron delocalization observed in the low-temperature alpha phase of pure solid nitrogen, which shows long-range orientational order.
authors.affiliation: Russian Research Centre "Kurchatov Institute," Kurchatov Square 46, Moscow 123182, Russia.
authors.initials: VG
authors.lastname: Storchak
authors.initials: DG
authors.lastname: Eshchenko
authors.initials: JH
authors.lastname: Brewer
authors.initials: GD
authors.lastname: Morris
authors.initials: SP
authors.lastname: Cottrell
authors.initials: SF
authors.lastname: Cox