Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 32: Spintronics and magnetic semiconductors (MA, jointly with HL)

HL 32.2: Talk

Tuesday, March 12, 2013, 09:45–10:00, H3

Electron Dynamics in a Ferrocene-Based Mixed-Valence Compound — •Nicolas Yeche¹, Lucas Mäde¹, Alexander Hildebrandt², Ulrike Pfaff², Simon Liebing³, Marco Günther¹, Heinrich Lang², Jens Kortus³, and Hans-Henning Klauss¹ — ¹TU Dresden, Dresden, Germany — ²TU Chemnitz, Chemnitz, Germany — ³TU Freiberg, Freiberg, Germany

Mixed-valence compounds are metal-organic molecules in which the metal centres, a priori identical, are in different oxidation states. These compounds usually stabilize through a strong electron delocalization between the various metallic atoms. Thanks to Mössbauer spectroscopy measurements, we followed the charge dynamics in the monocationic form of 2,5-Diferrocenyl,1-Phenyl-1H-Pyrrole. There, two a priori symmetrical ferrocene moieties contain one Fe(III) and one Fe(II).

We present results obtained from the solid state as well as in dispersed molecules in a tetrahydrofurane glass. From the fluctuation of the electric field gradient (EFG) at the iron nuclei sites we follow the charge fluctuation rate from room temperature down to 4.2K. Results on the average EFG are then compared with DFT calculations.