Thursday, July 25, 2013

1307.6404 (A. Beleanu et al.)

Large resistivity change and phase transition in LiMnAs    [PDF]

A. Beleanu, J. Kiss, G. Kreiner, C. Köhler, L. Müchler, W. Schnelle, U. Burkhardt, S. Chadov, S. Medvediev, D. Ebke, G. Cordier, B. Albert, A. Hoser, F. Bernardi, T. I. Larkin, D. Pröpper, A. V. Boris, B. Keimer, C. Felser
Antiferromagnetic semiconductors are new alternative materials for spintronic applications and spin valves. In this work, we report a detailed investigation of two antiferromagnetic semiconductors AMnAs (A = Li, LaO), which are isostructural to the well-known LiFeAs and LaOFeAs superconductors. Here we present a comparison between the structural, magnetic, and electronic properties of LiMnAs, LaOMnAs and related materials. Interestingly, both LiMnAs and LaOMnAs show a variation in resistivity with more than five orders of magnitude, making them particularly suitable for use in future electronic devices. From neutron and X-ray diffraction measurements on LiMnAs we have observed a magnetic phase transition corresponding to the Neel temperature of 373.8 K, and a structural transition from the tetragonal to the cubic phase at 768 K. These experimental results are supported by density functional theory (DFT) calculations.
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