Abstract
Ternary rare-earth manganese arsenides RE4Mn2As5 (RE = La–Pr) have been synthesized by direct reactions of the elements in the presence of Ga flux. They are the first examples of RE–Mn–As phases containing trivalent RE metals. Powder and single-crystal X-ray diffraction analysis revealed that they adopt the trigonal Ce4Zn2−xP5-type structure (space group P3¯m1, Z = 1), with cell parameters of a = 4.2–4.3 Å and c = 17.4–17.8 Å. The structure consists of four-layer-thick rocksalt-type slabs [REAs] built of REAs6 octahedra intergrown with [Mn2As2] slabs built of MnAs4 tetrahedra. In contrast to the analogous Zn-containing phases, a fully stoichiometric formula RE4Mn2As5 can be attained with no Mn deficiencies because there is no pseudogap in the density of states at the Fermi level.
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