title: Observation of strong-coupling effects in a diluted magnetic semiconductor Ga1-xFexN.
abstract: The giant Zeeman splitting of free excitons is measured in Ga(1-x)Fe(x)N. Magneto-optical and magnetization data imply the ferromagnetic sign and a reduced magnitude of the effective p-d exchange energy governing the interaction between Fe(3+) ions and holes in GaN, N_{0}beta(app)=+0.5+/-0.2 eV. This finding corroborates the recent suggestion that the strong p-d hybridization specific to nitrides and oxides leads to significant renormalization of the valence band exchange splitting.
authors.affiliation: Institute of Experimental Physics, University of Warsaw, Hoza 69, Warsaw, Poland. Wojciech.Pacuski@fuw.edu.pl
authors.forename: W
authors.initials: W
authors.lastname: Pacuski
authors.forename: P
authors.initials: P
authors.lastname: Kossacki
authors.forename: D
authors.initials: D
authors.lastname: Ferrand
authors.forename: A
authors.initials: A
authors.lastname: Golnik
authors.forename: J
authors.initials: J
authors.lastname: Cibert
authors.forename: M
authors.initials: M
authors.lastname: Wegscheider
authors.forename: A
authors.initials: A
authors.lastname: Navarro-Quezada
authors.forename: A
authors.initials: A
authors.lastname: Bonanni
authors.forename: M
authors.initials: M
authors.lastname: Kiecana
authors.forename: M
authors.initials: M
authors.lastname: Sawicki
authors.forename: T
authors.initials: T
authors.lastname: Dietl