Author/Authors :
Kanatzidis، Mercouri G. نويسنده , , Kauzlarich، Susan M. نويسنده , , Kim، Sung-Jin نويسنده , , Kim، Hyungrak نويسنده , , Olmstead، Marilyn M. نويسنده , , Long، Gary J. نويسنده , , Condron، Cathie L. نويسنده , , Park، Seon-Mi نويسنده , , Klavins، Peter نويسنده , , Grandjean، Fernande نويسنده , , Holm، Aaron P. نويسنده , , Hermann، Raphael P. نويسنده ,
Abstract :
A new transition-metal-containing Zintl compound, Eu10Mn6Sb13, was prepared by a high-temperature Sn-flux synthesis. The structure was determined by single-crystal X-ray diffraction. Eu10Mn6Sb13 crystallizes in the monoclinic space group C2/m with a = 15.1791(6) (angstrom), b = 19.1919(7) (angstrom), c = 12.2679(4) (angstrom), (beta)= 108.078(1) °, Z = 4 (R1 = 0.0410, wR2 = 0.0920), and T = 90(2) K. The structure of Eu10Mn6Sb13 is composed of double layers of Mn-centered tetrahedra separated by Eu2+ cations. The double layers are composed of edge- and corner-sharing Mn-centered tetrahedra which form cavities occupied by Eu2+ cations and [Sb2]4- dumbbells. Linear [Sb3]5- trimers bridging two tetrahedra across the cavity are also present. Bulk susceptibility data indicate paramagnetic behavior with a ferromagnetic component present below 60 K. Temperature-dependent electrical resistivity measurements show semiconducting behavior above 60 K (Ea = 0.115(2) eV), a large and unusually sharp maximum in the resistivity at ~40 K, and metallic behavior below 40 K. 151Eu Mossbauer spectra confirm that the europium is divalent with an average isomer shift of -11.2(1) mm/s at 100 K; the spectra obtained below 40 K reveal magnetic ordering of six of the seven europium sublattices and, at 4.2 K, complete ordering of the seven europium sublattices.