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Chemical bonding in V (TCNE)x (x~2) thin-film magnets grown in situ
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 75, no 6Article in journal (Refereed) Published
Abstract [en]

The molecule-based magnet V (TCNE)x, with TCNE=tetracyanoethylene, x˜2, shows an exceptionally high magnetic ordering temperature of about 400 K. With the aim to shed light on the origins of the robust magnetic ordering interactions, we have characterized the chemical bonding in V (TCNE)x thin films, prepared by an in situ chemical vapor deposition method, using photoelectron spectroscopy, x-ray absorption spectroscopy (XAS), and x-ray magnetic circular dichroism (XMCD). The XAS and XMCD results were interpreted by ligand field multiplet and charge transfer multiplet calculations, which show that the V-NC bonds are characterized by a large crystal field parameter 10Dq=2.3 eV and strong ligand to metal charge transfer effects, resulting in a hybrid V (3d) -CN ground state given by 60% 3 d3 and 40% 3 d4 L, where L is a hole on the cyano ligands. © 2007 The American Physical Society.

Place, publisher, year, edition, pages
2007. Vol. 75, no 6
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Engineering and Technology
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URN: urn:nbn:se:liu:diva-49994DOI: 10.1103/PhysRevB.75.064407OAI: oai:DiVA.org:liu-49994DiVA: diva2:270890
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-11

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de Jong, Michel PTengstedt, CarlKanciurzewska, AnnaCarlegrim, ElinSalaneck, William RFahlman, Mats

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Physical Review B. Condensed Matter and Materials Physics
Engineering and Technology

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