Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 13: Multiferroics 2 (jointly with DF, DS, KR, and MA)
TT 13.6: Vortrag
Montag, 11. März 2013, 16:15–16:30, H3
The effect of ion doping on multiferroic MnWO4 — •safa golrokh bahoosh1,3, julia m. wesselinowa2, and steffen trimper3 — 1Max Planck Institute of Microstructure Physics,Weinberg 2, 06120 Halle, Germany — 2University of Sofia, Department of Physics,Blvd. J. Bouchier 5, 1164 Sofia, Bulgaria — 3Institute of Physics, Martin-Luther-University, 06120 Halle, Germany
We have studied the ion doping effects on different transition temperatures in the multiferroic compound MnWO4 based on a microscopic model and within the framework of Green functions technique. It is shown that the exchange interaction constants can be changed due to the different ion doping radii. This leads to reduction of the magnetic phase transition temperature TN by doping with non-magnetic ions,such as Zn, Mg, whereas TN is enhanced by doping withtransition metal ions, such as Fe, Co. The different behavior of the temperature T1 (where up-up-down-down collinear spin structure appears) by Fe and Co doping could be explained taking into account the single-ion anisotropy.