Volume 94, Number 3, May 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 April 2011|
Evidence for the collapse of short-range magnetic order in CoO at the Néel temperature
IOM-CNR Istituto Officina dei Materiali del CNR, Area Science Park - Basovizza, Trieste, Italy, EU
2 CNISM and Dipartimento di Fisica, Università Roma Tre - Rome, Italy, EU
3 Department of Physics and Astronomy and Laboratory of Surface Modification, Rutgers University Piscataway, NJ, US
4 Dipartimento di Fisica, Università di Roma Tor Vergata - Rome, Italy, EU
5 Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare - Frascati, Italy, EU
Accepted: 24 March 2011
Auger-photoelectron coincidence spectroscopy is used for investigating the electronic properties of a CoO thin film above and below the magnetic transition temperature (TN). By using the dichroic effect in angle-resolved measurements, we identify and assign well-defined high-spin and low-spin structures in spite of the otherwise featureless Auger singles spectra, typically found for open-band systems. The disappearance of the dichroism for temperatures just above TN indicates a collapse of the surface short-range magnetic order, presumably due to a strongly reduced exchange field in the surface compared to that in the bulk.
PACS: 75.70.Rf – Surface magnetism / 79.60.-i – Photoemission and photoelectron spectra / 82.80.Pv – Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
© EPLA, 2011
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