First Principles Study of the Magnetic Properties of LaOMnAs

Abstract

Recent experiments reported giant magnetoresistance at room temperature in LaOMnAs. Here a density functional theory calculation is performed to investigate magnetic properties of LaOMnAs. The ground state is found to be the G-type antiferromagnetic order within the $ab$ plane but coupled ferromagnetically between planes, in agreement with recent neutron investigations. The electronic band structures suggest an insulating state which is driven by the particular G-type magnetic order, while a metallic state accompanies the ferromagnetic order. This relation between magnetism and conductance may be helpful to qualitatively understand the giant magnetoresistance effects.

3 pages, 3 figures. Proceeding of MMM conference, accepted

References in corpus (6)

• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
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• A variable temperature study of the crystal and magnetic structures of the giant magnetoresistant materials LnMnAsO (Ln = La, Nd)
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• (LaTiO${}_3$)${}_n$/(LaVO${}_3$)${}_n$ as a model system for unconventional charge transfer and polar metallicity
• Higher-order topological insulators in a crisscross antiferromagnetic model
• Strong room-temperature blue-violet photoluminescence of multiferroic BaMnF${}_4$