Studies on the compounds in the BaFeS system. I. Linear chain antiferromagnetism of Ba2FeS3 and related compounds Ba2CoS3 and Ba2MnS3

Magnetic susceptibilities of Ba2FeS3, Ba2CoS3, and Ba2MnS3 show rounded maxima at 130, 125, and 100 K, respectively, which are due to quasi-one-dimensional antiferromagnetic short-range ordering. Intrachain interactions, J k , are estimated to be −20, −15, and −12 K, respectively. 57Fe Mossbauer spectra of Ba2FeS3 and 57Fe-doped Ba2CoS3 and Ba2MnS3 at 4.2 K show long-range antiferromagnetic ordering, due to the interchain interaction. The profile of Mossbauer spectra at 4.2 K is analyzed based on the coexistence of magnetic hyperfine and quadrupole interactions, and magnetic hyperfine fields at 4.2 K are estimated to be 36, 29, and 59 kOe, respectively.