1. Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr1−xCaxNiReO6.
- Author
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Jana, Somnath, Aich, Payel, Kumar, P. Anil, Forslund, O. K., Nocerino, E., Pomjakushin, V., Månsson, M., Sassa, Y., Svedlindh, Peter, Karis, Olof, Siruguri, Vasudeva, and Ray, Sugata
- Subjects
CRYSTALLOGRAPHY ,FERROMAGNETIC materials ,MAGNETIC ions ,ANTIFERROMAGNETIC materials ,MAGNETIC materials - Abstract
The magnetic ground states in highly ordered double perovskites LaSr
1−x Cax NiReO6 (x = 0.0, 0.5, 1.0) are studied in view of the Goodenough-Kanamori rules of superexchange interactions in this paper. In LaSrNiReO6 , Ni and Re sublattices are found to exhibit curious magnetic states separately, but no long range magnetic ordering is achieved. The magnetic transition at ~255 K is identified with the independent Re sublattice magnetic ordering. Interestingly, the sublattice interactions are tuned by modifying the Ni-O-Re bond angles through Ca doping. Upon Ca doping, the Ni and Re sublattices start to display a ferrimagnetically ordered state at low temperature. The neutron powder diffraction data reveals long range ferrimagnetic ordering of the Ni and Re magnetic sublattices along the crystallographic b-axis. The transition temperature of the ferrimagnetic phase increases monotonically with increasing Ca concentration. [ABSTRACT FROM AUTHOR]- Published
- 2019
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