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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.30: Poster
Tuesday, February 26, 2008, 15:15–18:30, Poster E
Properties of ternary rare earth REXY compounds with 18 valence electrons — •Frederick Casper and Claudia Felser — Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz
Ternary rare earth compounds REXY, where RE is a lanthanide element, Y a transition element and Z is an sp element, offer a large variety of structure types. Our research focuses on compounds LiGaGe and MgAgAs (C1b) structure which all have 18 valence electrons. Magnetic and resistivity measurements were used to examine some of these compounds. Most of the compounds order antiferromagnetic at low temperatures. While compounds with LiGaGe structure are metallic, many of the compounds with MgAgAs structure are semiconducting. Additionally for some of these compounds a metal-insulator transition was found. The metal - insulator transition temperature depends strongly on the preparation conditions. Both the magnetic ground states and the resistance behavior are in good agreement with electronic band structure calculations.
This work was supported by DFG grant FE633/1-1 within SPP1166.