Orbital and Spin Excitations in Cobalt Oxide
Z. Yamani, W.J.L. Buyers, R.A. Cowley, D. Prabhakaran
TL;DR
This study uses neutron scattering to identify and analyze magnetic excitation branches in orbitally active CoO across a wide temperature range, revealing coupled orbital and spin dynamics.
Contribution
It introduces a model for coupled orbital and spin states of Co2+ considering crystal field and tetragonal distortion, based on experimental data.
Findings
Identified new magnetic excitation branches up to 15 THz.
Observed temperature dependence of magnetic excitations.
Developed a model for coupled orbital and spin states.
Abstract
By means of neutron scattering we have determined new branches of magnetic excitations in orbitally active CoO (TN=290 K) up to 15 THz and for temperatures from 6 K to 450 K. Data were taken in the (111) direction in six single-crystal zones. From the dependence on temperature and Q we have identified several branches of magnetic excitation. We describe a model for the coupled orbital and spin states of Co2+ subject to a crystal field and tetragonal distortion.
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