Spin glass and semiconducting behavior in one-dimensional BaFe2-delta Se3 (delta approximate to 0.2) crystals

Article

关键词: BA-FE-S;    IRON;    CHEMISTRY;    BA6FE8S15;    BAFE2S3;    PHASES;   

DOI  :  10.1103/PhysRevB.84.245132

来源: SCIE

【 摘 要 】

We investigate the physical properties and electronic structure of BaFe1.79(2)Se3 crystals, which were grown out of tellurium flux. The crystal structure of the compound, an iron-deficient derivative of the ThCr2Si2-type, is built upon edge-shared FeSe4 tetrahedra fused into double chains. The semiconducting BaFe1.79(2)Se3 (rho(295K) = 0.18 Omega.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 approximate to 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 (rho(295K) = 0.11 Omega.cm and E-g = 0.22 eV) and a lower spin glass freezing temperature (T-f approximate to 15 K), corroborating with higher electrical conductivity reported for BaFe2S3. According to the electronic structure calculations, BaFe2Se3 can be considered as a one-dimensional ladder structure with a weak interchain coupling.

【 授权许可】

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