Volume 96, Number 3, November 2011
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 October 2011|
dd excitations in three-dimensional q-space: A nonresonant inelastic X-ray scattering study on NiO
National Synchrotron Radiation Research Center (NSRRC) - Hsinchu 30076, Taiwan
2 Japan Synchrotron Radiation Research Institute (JASRI) - Kouto 1-1-1, Sayo, Hyogo 679-5198, Japan
3 National Synchrotron Light Source II, Brookhaven National Laboratory - Upton, NY 11973, USA
4 Max Planck Institute Stuttgart - Heisenbergstrasse 1, 70569 Stuttgart, Germany, EU
5 Institute of Physics, Academia Sinica - Nankang, Taipei 11529, Taiwan
6 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory Upton, NY 11973, USA
Accepted: 8 September 2011
We have studied the dd excitations in NiO over three-dimensional momentum (q) space using nonresonant inelastic X-ray scattering. In addition to the previously reported peaks at 1.7 and 3.0 eV, another peak is found at 1.0 eV, with a dramatically different intensity distribution in momentum space.Contrary to the other two peaks that form oval structures maximizing at  directions, the 1.0 eV peak displays appreciable intensity along low-symmetry axes near  and , but vanishes in the three principal axes , , and , indicating a significant difference in the exciton wave function.We find good agreement between the experimental data and two state-of-the-art theories, advocating investigating other strongly correlated materials with similar experimental/theoretical approaches.
PACS: 78.20.-e – Optical properties of bulk materials and thin films / 71.35.-y – Excitons and related phenomena / 78.70.Ck – X-ray scattering
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.