Crystal structure and magnetism of MnO under pressure
Résumé
Manganese oxide is a prototype of an antiferromagnetic Mott-insulator. Here we investigate the interplay of magnetic ordering and lattice distortion across the Néel temperature TN under pressure using neutron and x-ray diffraction. We find an increase of TN with a rate of dTN /dP =+4.5(5) K/GPa, an increase of the rhombohedral distortion α by dα/dP =+0.018 deg./GPa, as well as a volume striction which is insensitive to pressure. These results allow retrieving the dependence of the coupling constants J1 and J2 on interatomic distances and compare it to first-principles predictions. Antiferromagnetic diffuse scattering was observed up to ≈ 1.2 TN , and long-range magnetic order appears at room temperature at 42 GPa.
Domaines
Physique [physics]
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Klotz et al. - 2020 - Crystal structure and magnetism of MnO under press.pdf (858.35 Ko)
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