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Crystal structure and magnetism of MnO under pressure

Klotz, S.*; Komatsu, Kazuki*; Polian, A.*; Machida, Shinichi*; Sano, Asami; Iti$'e$, J.-P.*; Hattori, Takanori

Manganese oxide (MnO) is a prototype of an antiferromagnetic Mott-insulator. Here we investigate the interplay of magnetic ordering and lattice distortion across the N$'e$el temperature $$T_{N}$$ under pressure using neutron and X-ray diffraction. We find an increase of $$T_{N}$$ with a rate of $$T_{N}/dP$$ = +4.5(5) K/GPa, an increase of the rhombohedral distortion $$alpha$$ by $$dalpha/dP$$ = +0.018$$^{circ}$$/GPa, as well as a volume striction which is insensitive to pressure. These results allow to retrieve the dependence of the coupling constants $$J_{1}$$ and $$J_{2}$$ on interatomic distances and compare it to first-principles predictions. Antiferromagnetic diffuse scattering was observed up to $$sim$$1.2 $$T_{N}$$, and long-range magnetic order appears at room temperature at 42 GPa.

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Category:Materials Science, Multidisciplinary

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