Magnetic Properties of the Melilite-Type Oxysulfide Sr2MnGe2S6O: Magnetic Interactions Enhanced by Anion Substitution

Takashi Endo; Yoshihiro Doi; Makoto Wakeshima; Keita Suzuki; Yasutaka Matsuo; Keitaro Tezuka; Takuya Ohtsuki; Yue Jin Shan; Yukio Hinatsu

doi:10.1021/acs.inorgchem.6b02505

Magnetic Properties of the Melilite-Type Oxysulfide Sr₂MnGe₂S₆O: Magnetic Interactions Enhanced by Anion Substitution

Inorg Chem. 2017 Mar 6;56(5):2459-2466. doi: 10.1021/acs.inorgchem.6b02505. Epub 2017 Feb 15.

Authors

Takashi Endo, Yoshihiro Doi, Makoto Wakeshima, Keita Suzuki, Yasutaka Matsuo, Keitaro Tezuka¹, Takuya Ohtsuki¹, Yue Jin Shan¹, Yukio Hinatsu

Affiliation

¹ Research Division of Functional Materials Design, Graduate School of Engineering, Utsunomiya University , Utsunomiya 321-8585, Japan.

PMID: 28199088
DOI: 10.1021/acs.inorgchem.6b02505

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, S^2- and O^2-, 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 (T_N = 15.5 K) that is much higher than that of the oxide analogue Sr₂MnGe₂O₇ (T_N = 4.4 K). DFT calculations showed that the magnetic interaction is enhanced by covalency in the Mn-S bonding.