TY - JOUR
T1 - Spin glass and semiconducting behavior in one-dimensional BaFe 2-δSe 3 (δ
AU - Saparov, Bayrammurad
AU - Calder, Stuart
AU - Sipos, Balazs
AU - Cao, Huibo
AU - Chi, Songxue
AU - Singh, David J.
AU - Christianson, Andrew D.
AU - Lumsden, Mark D.
AU - Sefat, Athena S.
PY - 2011/12/28
Y1 - 2011/12/28
N2 - 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 2Si 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 Ω•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 Ω•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 2S 3. According to the electronic structure calculations, BaFe 2Se 3 can be considered as a one-dimensional ladder structure with a weak interchain coupling.
AB - 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 2Si 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 Ω•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 Ω•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 2S 3. According to the electronic structure calculations, BaFe 2Se 3 can be considered as a one-dimensional ladder structure with a weak interchain coupling.
UR - http://www.scopus.com/inward/record.url?scp=84855417412&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.84.245132
DO - 10.1103/PhysRevB.84.245132
M3 - Article
AN - SCOPUS:84855417412
SN - 1098-0121
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 24
M1 - 245132
ER -