Structure and magnetism of ALa2FeNiSbO9 (A=Ca, Sr, Ba) and CaLa2FeCoSbO9
Due to the presence of only very weak magnetic Bragg peaks in powder neutron diffraction data, despite SQUID magnetometry revealing La3Ni2SbO9 to be ferrimagnetic below 105 K, we described La3Ni2SbO9 as the first example of a relaxor ferromagnet. By introducing iron onto the B sites to form ALa2FeNiSbO9 (A=Ca, Sr, Ba) we have substantially raised the ferrimagnetic transition temperature to around 250 K in all cases. The same magnetic behaviour is observable for the related perovskite CaLa2FeCoSbO9. To search for differences in the nuclear and magnetic structure between these novel compositions and La3Ni2SbO9 we propose to collect powder neutron diffraction data on instrument D2b at room temperature and at 5K using a wavelength of 1.59 Å plus one data set on D1b for each of the four samples. We therefore request two days of beamtime on instrument D2b and one day of beamtime on instrument D1b.
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BATTLE Peter; GILES Emily; SUARD Emmanuelle and Y. Tang. (2017). Structure and magnetism of ALa2FeNiSbO9 (A=Ca, Sr, Ba) and CaLa2FeCoSbO9. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2508
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