Authors: Nandini R
Abstract: This paper reports the neutron diffraction measurements on LaSrCoRuO6 and La2xSr2-2xCo2xRu2-2xO6. Based on these measurements, in LaSrCoRuO6, it is interpreted to be due disorder in site occupancy of Co
and Ru leading to octahedral distortions and formation of the Ru-O-Ru ferromagnetic linkages which are known to align ferro magnetically. Ferromagnetic interactions are clearly seen in the disordered LaSrCoRuO6 which has a larger B-site occupancy disorder of the Co and Ru sites. In La2xSr2-2xCo2xRu2-2xO6, the compounds crystallize in the
double perovskite structure. The 20K neutron data shows extra super-lattice reflections due to anti ferromagnetic ordering in x = 0.75. These reflections are accounted for by an anti ferromagnetic alignment of the Co and Ru spins.
Keywords: Anti ferromagnetism, Double Perovskite, Itinerant ferrimagnetism, negative magneto resistance.
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