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The chiral helimagnet Cr 1/3 NbS 2 has been investigated by magnetic, transport and thermal properties measurements on single crystals and by first principles electronic structure calculations.

We investigate the physical properties and electronic structure of BaFe 1.79(2) Se 3 crystals, which were grown out of tellurium flux. The crystal structure of the compound, an iron-deficient derivative of the ThCr 2 Si 2 -type, is built upon edge-shared FeSe 4 tetrahedra fused into double chains. The semiconducting BaFe 1.79(2) Se 3 (ρ 295K = 0.18 ·cm and E g = 0.30 eV) does not order magnetically; however, there is evidence for short-range magnetic correlations of spin glass type (T f ≈ 50 K) in magnetization, heat capacity, and neutron diffraction results. A one-third substitution of selenium with sulfur leads to a slightly higher electrical conductivity (ρ 295K = 0.11 ·cm and E g = 0.22 eV) and a lower spin glass freezing temperature (T f ≈ 15 K), corroborating with higher electrical conductivity reported for BaFe 2 S 3 . According to the electronic structure calculations, BaFe 2 Se 3 can be considered as a one-dimensional ladder structure with a weak interchain coupling.

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