title: Magnetic Properties of the Melilite-Type Oxysulfide Sr2MnGe2S6O: Magnetic Interactions Enhanced by Anion Substitution.
abstract: The synthesis, crystal structures, photoluminescence, and magnetic properties of the melilite-type oxysulfide Sr2MnGe2S6O were investigated. This compound crystallizes in the melilite structure with space group P4̅21m, in which two kinds of anions, S2-and O2-, occupy different crystallographic sites in an ordered manner. The temperature dependence of the magnetic susceptibility of Sr2MnGe2S6O shows a broad peak due to a two-dimensional magnetic interaction between Mn ions in the ab plane. The specific heat data show that this compound has an antiferromagnetic transition temperature (TN= 15.5 K) that is much higher than that of the oxide analogue Sr2MnGe2O7(TN= 4.4 K). DFT calculations showed that the magnetic interaction is enhanced by covalency in the Mn-S bonding.
authors.forename: Takashi
authors.identifier: http://orcid.org/0000-0003-0642-8748
authors.initials: T
authors.lastname: Endo
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Doi
authors.forename: Makoto
authors.initials: M
authors.lastname: Wakeshima
authors.forename: Keita
authors.initials: K
authors.lastname: Suzuki
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Matsuo
authors.affiliation: Research Division of Functional Materials Design, Graduate School of Engineering, Utsunomiya University , Utsunomiya 321-8585, Japan.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Tezuka
authors.affiliation: Research Division of Functional Materials Design, Graduate School of Engineering, Utsunomiya University , Utsunomiya 321-8585, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Ohtsuki
authors.affiliation: Research Division of Functional Materials Design, Graduate School of Engineering, Utsunomiya University , Utsunomiya 321-8585, Japan.
authors.forename: Yue Jin
authors.initials: YJ
authors.lastname: Shan
authors.forename: Yukio
authors.initials: Y
authors.lastname: Hinatsu