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ScFe 6 Ge 4 with the LiFe 6 Ge 4 -type structure (space group R 3 ¯ m), which has a double-layered kagome lattice (18 h site) of Fe crystallographically equivalent to that of a well-known topological ferromagnet Fe 3 Sn 2 , is newly found to be antiferromagnetic (AFM) with a high Néel temperature of T N ≈ 650 K, in contrast to the ferromagnetic (FM) ground state previously proposed in a literature. 45Sc nuclear magnetic resonance experiment revealed the absence of a hyperfine field at the Sc site, providing microscopic evidence for the AFM state and indicating AFM coupling between the bilayer kagome blocks. The stability of the AFM structure under the assumption of FM intra-bilayer coupling is verified by DFT calculations. • LiFe 6 Ge 4 -type ScFe 6 Ge 4 is a double-layered kagome antiferromagnet. • The Néel temperature is as high as 650 K. • In-bilayer ferromagnetic and inter-bilayer antiferromagnetic couplings were proposed. • The stability of the antiferromagnetic structure was verified by DFT calculations. • ScFe 6 Ge 6 is an antiferromagnetic alternative to the topological magnet Fe 3 Sn 2. [ABSTRACT FROM AUTHOR]

A novel thermophilic bacterium, strain SSM-sur55T, was isolated from a chimney structure at the Urashima site on the Southern Mariana Trough in the Pacific Ocean. Growth was observed at temperatures between 25 and 60 °C (optimum, 55 °C; 180 min doubling time), at pH values between 5.3 and 7.2 (optimum, pH 5.9) and in the presence of between 1.6 and 5.6% (w/v) NaCl (optimum, 3.2%). The isolate used molecular hydrogen as its sole energy source, carbon dioxide as its sole carbon source, ammonium as its sole nitrogen source, and elemental sulfur as its sole sulfur source. Thiosulfate, molecular oxygen (0.1%, v/v) or elemental sulfur was utilized as its sole electron acceptor. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain SSM-sur55T belonged to the genus Hydrogenimonas of the class " Campylobacteria ", and its closest relative was Hydrogenimonas thermophila EP1-55-1%T (94.9%). On the basis of the phylogenetic, physiological and molecular characteristics, strain SSM-sur55T represents a novel species within the genus Hydrogenimonas , for which the name Hydrogenimonas urashimensis sp. nov. is proposed, with the type strain SSM-sur55T (JCM 19825 = KCTC 15926). [ABSTRACT FROM AUTHOR]