Preparation and characterisation of the double perovskite Sr2TaMnO6
2006 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, Vol. 299, no 1, 161-169 p.Article in journal (Refereed) Published
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).
Place, publisher, year, edition, pages
2006. Vol. 299, no 1, 161-169 p.
spin glass, insulator, frequency dependence, double-exchange, NPD, spin-glass, viscosity
IdentifiersURN: urn:nbn:se:kth:diva-15376DOI: 10.1016/j.jmmm.2005.03.100ISI: 000234666800021ScopusID: 2-s2.0-27744440498OAI: oai:DiVA.org:kth-15376DiVA: diva2:333417
QC 201005252010-08-052010-08-05Bibliographically approved