Volume 105, Number 1, January 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||31 January 2014|
Direct structural and spectroscopic investigation of ultrathin films of tetragonal CuO: Six-fold coordinated copper
1 MESA + Institute for Nanotechnology, University of Twente - P.O. Box 217, 7500AE, Enschede, The Netherlands
2 EMAT, University of Antwerp - Groenenborgerlaan 171, B-2020 Antwerp, Belgium
3 Department of Chemical Engineering and Materials Science, University of California-Davis - Davis, CA 95616, USA
4 Materials Science and Technology Division, Oak Ridge National Laboratory - Oak Ridge, TN 37831, USA
5 Advanced Light Source, Lawrence Berkeley National Laboratory - 1 Cyclotron Rd, MS6R2100, Berkeley, CA 94720, USA
Received: 17 November 2013
Accepted: 22 December 2013
Unlike other 3d transition metal monoxides (MnO, FeO, CoO, and NiO), CuO is found in a low-symmetry distorted monoclinic structure rather than the rocksalt structure. We report here of the growth of ultrathin CuO films on SrTiO3 substrates; scanning transmission electron microscopy was used to show the stabilization of a tetragonal rocksalt structure with an elongated c-axis such that and the Cu-O-Cu bond angle , pointing to metastable six-fold coordinated Cu. X-ray absorption spectroscopy demonstrates that the hole at the Cu site for the CuO is localized in orbital unlike the well-studied monoclinic CuO phase. The experimental confirmation of the tetragonal structure of CuO opens up new avenues to explore electronic and magnetic properties of six-fold coordinated Cu.
PACS: 73.61.Le – Other inorganic semiconductors / 68.37.Ma – Scanning transmission electron microscopy (STEM) / 78.70.Dm – X-ray absorption spectra
© EPLA, 2014
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.