Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Spintronics and Magnetic Semiconductors (jointly with HL)
MA 15.6: Vortrag
Dienstag, 12. März 2013, 10:45–11:00, H3
Physical, chemical and structural characterization of the antiferromagnetic semiconductor LiMnAs. — •Andreea Beleanu, Guido Kreiner, Walter Schnelle, Gerhard H. Fecher, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.
The compound LiMnAs is a promising candidate for spintronic applications due to its antiferromagnetic and semiconducting behavior. Polycrystalline LiMnAs was obtained as single-phase material from stoichiometric amounts of high purity elements. The compound was characterized by powder x-ray diffraction, metallographic examinations, chemical and thermal analysis and by measurements of magnetic and transport properties. LiMnAs crystallizes in the tetragonal space group P4/nmm with an antiferromagnetic order. It undergoes a phase transition to a cubic phase at 600∘C. DC resistivity measurements indicate a semiconducting behavior. Using the Arrhenius plot two sections of activated conduction with a small band gap Eg of 0.21 eV indicating doped levels at low temperatures and a larger Eg of 0.57 eV at high temperatures were determined.