Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.75: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Magnetic and orbital order in the system Fe_1−xCu_xCr₂S₄ (0≤ x ≤0.9) studied by Mössbauer spectroscopy — •Elaheh Sadrollahi¹, Mathias Kraken¹, Nicole Christiane Schmidt¹, F. Jochen Litterst¹, Vladimir Tsurkan², Alois Loidl², and G. Michael Kalvius³ — ¹IPKM, Technische Universität Braunschweig — ²Experimentalphysik V, Universität Augsburg — ³Physik Department, Technische Universität München

Cr based thiospinels of the type Fe_1−xCu_xCr₂S₄ (0≤ x ≤ 1) have attracted considerable attention due to a variety of interesting electronic and magnetic properties. We have performed a systematic Mössbauer spectroscopic study of the spinel system Fe_1−xCu_xCr₂S₄ with 0≤ x ≤ 0.9 between 4 and 300 K. We could follow the gradual transformation from Fe⁺² to Fe⁺³ in dependence on Cu doping and the related changes in magnetic ordering.

At low temperatures we find for low Cu doping changes in nuclear electric quadrupole interaction due to changes in the crystalline electric field connected with orbital ordering. Dynamic line broadening related with magnetic orbital dynamics will be discussed.