Chemical bonding in V(TCNE)_x (x～2) thin-film magnets grown in situ

M. P. de Jong; C. Tengstedt; A. KanciurzewskaE. CarlegrimW. R. SalaneckM. Fahlman

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Chemical bonding in V(TCNE)_x (x～2) thin-film magnets grown in situ

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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 spectros-copy (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=23 eV and strong ligand to metal charge transfer effects, resulting in a hybrid V(3d)-CN ground state given by 60 3d~3 and 40 3d~4L, where L is a hole on the cyano ligands.

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《Physical review, B. Condensed matter and materials physics》 |2007年第6期|064407.1-064407.7|共9页
作者
M. P. de Jong; C. Tengstedt; A. KanciurzewskaE. CarlegrimW. R. SalaneckM. Fahlman;
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Department of Physics (IFM), Linkoping University, S-581 83 Linkoping, Sweden;

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正文语种英语
中图分类固体物理学;
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spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies; synchrotron-source x-ray scattering; etc.); polymers; organic compounds;

Chemical bonding in V(TCNE)_x (x～2) thin-film magnets grown in situ

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