V(TCNE)_x, is especially interesting since it features an ordering temperature above room temperature (T_C~400K) [1]. We have prepared and characterized thin films of V(TCNE)_x in ultra-high vacuum using a novel film growth technique based on in-situ chemical vapor deposition of tetracyanoethylene and bis-benzene vanadium. The in-situ preparation method enabled, for the first time, experimental analysis of the electronic structure [2]. N(1s) and C(1s) XPS spectra clearly indicate the predominant presence of TCNE^-. The charge state of the vanadium ion was assigned as V²⁺, using the XPS V(2p) peak positions. Upon comparing the valence band spectra with those of two model compounds, condensed TCNE and Rb-intercalated TCNE [3], strong modifications are observed in the TCNE-related states in V(TCNE)_x that point to a covalently bonded network as opposed to an ionic charge transfer complex. The electronic, chemical structure and the magnetic properties of V(TCNE)_x are studied using synchrotron radiation techniques such as photoelectron spectroscopy (PES), resonant photoelectron spectroscopy (RPES), near edge X-ray absorption fine structure spectroscopy (NEXAFS), and X-ray magnetic circular dichroism (XMCD).

References:

1. K.I. Pokhodnya, A.J. Epstein and J.S. Miller, Adv. Mat. 12, 410-13 (2000).

2. C. Tengstedt, M. P. de Jong, A. Kanciurzewska, E. Carlegrim, W.R. Salaneck and M. Fahlman, Phys. Rev. Lett. 96, 057209 (2006).

3. C. Tengstedt, M. Unge, M.P.d. Jong, S. Stafstrom, W.R. Salaneck and M. Fahlman, Physical Review B (Condensed Matter and Materials Physics) 69, 165208-1-7 (2004).

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1. Pentacene thin films for organic spintronics applications
2. Efficient spin injection through exchange coupling at organic semiconductor/ferromagnet heterojunction
3. Charge transfer in conjugated materials and at interfaces thereof in dynamic and static descriptions