title: Suppression of antiferromagnetic interactions through Cu vacancies in Mn-substituted CuInSe2 chalcopyrites.
abstract: Stoichiometric and Cu-poor Cu(0.95-x)Mn(0.05)InSe(2) (x = 0-0.20) compounds were synthesized by high-temperature, solid-state reactions. The presence of copper vacancies is revealed by Rietveld refinements of combined neutron and x-ray powder diffraction data. The antiferromagnetic interaction is depressed by the copper deficiency, which may be explained as the competition between the antiferromagnetic Mn-Se-Mn superexchange interaction and the hole-mediated ferromagnetic exchange induced by the copper vacancy. The introduction of copper vacancies is proposed to be a viable route to impart carrier-mediated ferromagnetic exchange in the chalcopyrite-based dilute magnetic semiconductors.
authors.affiliation: Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282, USA.
authors.forename: Jinlei
authors.initials: J
authors.lastname: Yao
authors.forename: Carl D
authors.initials: CD
authors.lastname: Brunetta
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Aitken
mesh_terms: D003300:Copper / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D060328:Magnetic Phenomena; D008345:Manganese / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*
chemical_list: C101793:copper indium diselenide; D007204:Indium; C012819:chalcopyrite; D008345:Manganese; D003300:Copper; D012643:Selenium