Preparation and characterisation of the double perovskite Sr2TaMnO6 |
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| Authors: | Martin Valldor Saeid Esmaeilzadeh Magnus Andersson Andrzej Morawski |
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| Institution: | 1. Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstr. 36, D-48149 Münster, Germany;2. Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden;3. Solid State Physics, KTH-Electrum, Electrum 229, SE-164 40 Kista, Sweden;4. High Pressure Research Center, Polish Academy of Sciences, P.O. Box 65, 01-142 Warsaw, Poland |
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| Abstract: | The presented compound, Sr2TaMnO6, has a weak, disordered magnetic structure. The metal oxide was prepared under high isostatic oxygen pressure. The doubling of the perovskite structure was proven with electron diffraction and powder neutron diffraction. Combining neutron- and X-ray diffraction data, the room-temperature structure was modelled with the Rietveld method. Both octahedral positions are partially occupied by Mn and Ta, but with different Mn/Ta ratios. AC- and DC-magnetic measurements indicate a magnetic transition at about 17 K and the AC-magnetic susceptibility, both real and imaginary part, is frequency dependent, suggesting that the material has a spin-glass feature. The magnetic spins freeze during a wide temperature range and a possible explanation is a competative situation between the double exchange (ferromagnetism) and the super-exchange (anti-ferromagnetism). |
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| Keywords: | 71 20 Ps 72 80 Sk 75 10 Nr 75 30 Cr 75 50 Lk 76 60 Es |
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