Synthesis and Structures of New Layered Ternary Manganese Selenides: AMnSe2 (A=Li, Na, K, Rb, Cs) and Na2Mn2Se3

Magnetic and structural phase diagram of CaMn2Sb2

“…An initial composition of 2:4:4:15 Ca:Mn:Sb:Sn was found to result in the largest and highest quality crystals. La doping was accomplished via the partial replacement of Ca with La and Na doping with NaCl via the cation exchange technique 20 . The crystals contained inclusions of Sn flux, but after treating the cleanest specimens with a 1% Nital etchant solution, Meissner measurements of the corresponding superconducting volume fraction showed that we were able to produce crystals with between 0 and 3% Sn, a substantial improvement over the previous report.…”

Prediction of half-metallic properties for the AMnSe2 (A=Rb, Cs) compounds from first-principle calculations

“…The X-ray powder data of the studied materials, reported by Kim and Hughbanks [26], reveal that under normal conditions, the AMnSe2 (A ¼Rb, Cs) compounds are isostructural with AgTiTe 2 phase prototype, space group I-4m2 (No. 119) of the tetragonal system, with 2 formula units per one unit cell.…”

“…[26] 4.32 (7) 14.47 (2) 270.04 3.35 Table 2 Calculated atomic coordinates of the AMnSe 2 (A ¼Rb, Cs). …”

“…1 presents a 2×2×1 super cell of the studied compounds. Accordingly, RbMnSe 2 and CsMnSe 2 are layered compounds in which [MnSe 4/2 ] À 1 layers are built up by four-corner-shared MnSe 4 tetrahedra and each layer is separated by alkali atoms [26].…”

“…An intensive scientific effort has been devoted to the investigation of the ternary manganese chalcogenides A-Mn-Q, where A ¼alkali metal and Q¼ chalcogenides [19][20][21][22][23][24][25]. In 1999, Kim and Hughbanks [26] reported the synthesis, structural characterization and magnetic properties of the ternary metal chalcogenides RbMnSe 2 and CsMnSe 2 . To the best of our knowledge, this is the only study that was devoted to these two compounds.…”