Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-06-28
Phys. Rev. B, 81, 241103(R), 2010
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures
Scientific paper
Phonon dispersion of detwinned NiO is measured using inelastic x-ray scattering. It is found that, near the zone center, the energy of the transverse optical phonon mode polarized parallel to the antiferromagnetic order is ~1 meV lower than that of the mode polarized perpendicular to the order, at room temperature. This is explained via anisotropic polarization of the Ni and O atoms, as confirmed using a Berry's phase approach with first-principles calculations. Our explanation avoids an apparent contradiction in previous discussions focusing on Heisenberg interaction.
Baron Alfred Q. R.
Tsutsui Satoshi
Uchiyama Hideki
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