title: Bound magnetic polarons in the 3d-electron ferromagnetic spinel semiconductor CdCr2Se4.
abstract: Muon spin rotation/relaxation spectroscopy has been employed to study electron localization into a bound magnetic polaron around the positive muon in the 3d magnetic spinel semiconductor CdCr2Se4 at temperatures up to 300 K (far above the ferromagnetic transition at Tc = 130 K) in magnetic fields up to 7 T. Electron localization into a magnetic polaron occurs due to its strong exchange interaction with the magnetic 3d electrons of local Cr(3 +) ions, which confines its wavefunction to within R≈0.3 nm, allowing significant overlap with both the nearest and the next nearest shells of Cr ions. Formation of such magnetic polarons may explain peculiar electronic and magnetic properties of magnetic semiconductors.
authors.affiliation: Russian Research Centre 'Kurchatov Institute', Kurchatov Square 1, Moscow 123182, Russia.
authors.forename: Vyacheslav G
authors.initials: VG
authors.lastname: Storchak
authors.forename: Jess H
authors.initials: JH
authors.lastname: Brewer
authors.forename: Peter L
authors.initials: PL
authors.lastname: Russo
authors.forename: Scott L
authors.initials: SL
authors.lastname: Stubbs
authors.forename: Oleg E
authors.initials: OE
authors.lastname: Parfenov
authors.forename: Roger L
authors.initials: RL
authors.lastname: Lichti
authors.forename: Tel'man G
authors.initials: TG
authors.lastname: Aminov