EuZn2Si2 and EuZn2Ge2 Grown from Zn or Ga(ln)/Zn Flux |
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Authors: | A. Grytsiv,D. KaczorowskiA. Leithe-Jasper,P. RoglC. Godart,M. PotelH. Noë l |
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Affiliation: | a Institut für Physikalische Chemie, Universität Wien, Währingerstr. 42, A-1090, Wien, Austriab W. Trzebiatowski Institute for Low Temperature and Structure Research, Polish Academy of Sciences, 1410, P-50-950, Wroclaw, Polandc CNRS-UPR209, ISCSA, 2-8 rue Henri Dunant, F94320, Thiais, France, LURE, CNRS, Universite Paris Sud, 91405, Orsay, Franced Laboratoire de Chimie du Solide et Inorganique Moléculaire, UMR CNRS 6511, Université de Rennes I, Avenue du Général Leclerc, F-35042, Rennes Cedex, France |
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Abstract: | Single crystals of the novel ternary compounds EuZn2Si2 and EuZn2Ge2 were grown from pure gallium, indium, or zinc metal used as a flux solvent. Crystal properties were characterized using X-ray single-crystal analyses via Gandolfi and Weissenberg film techniques and by four-circle X-ray single-crystal diffractometry. The new compounds crystallize with ternary derivative structures of BaAl4, i.e., EuZn2Si2 with ThCr2Si2-type (a=0.42607(2) nm, c=1.03956(5) nm, I4/mmm, R1=0.038) and EuZn2Ge2 with CaBe2Ge2-type (a=0.43095(2) nm, c=1.07926(6) nm, P4/nmm, R1=0.067). XAS and magnetic measurements on EuZn2Si2 and EuZn2Ge2 revealed in both compounds the presence of Eu2+ ions carrying large magnetic moments, which order magnetically at low temperatures. The magnetic phase transition occurs at TN=16 and 7.5 K for the silicide and the germanide, respectively. In EuZn2Si2 there occurs a spin reorientation at 13 K and furthermore some canting of antiferromagnetically ordered moments below about 10 K. In EuZn2Ge2 a canted antiferromagnetic structure is formed just at TN. |
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Keywords: | europium compounds X-ray single-crystal refinement EuZn2Si2 with ThCr2Si2-type EuZn2Ge2 with CaBe2Ge2-type complex magnetic order with ground state Eu2+. |
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