Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr_1−xCa_xNiReO₆.

Jana, Somnath; Aich, Payel; Kumar, P. Anil; Forslund, O. K.; Nocerino, E.; Pomjakushin, V.; Månsson, M.; Sassa, Y.; Svedlindh, Peter; Karis, Olof; Siruguri, Vasudeva; Ray, Sugata

The magnetic ground states in highly ordered double perovskites LaSr1−xCaxNiReO6 (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.

CRYSTALLOGRAPHY; FERROMAGNETIC materials; MAGNETIC ions; ANTIFERROMAGNETIC materials; MAGNETIC materials

Scientific Reports, 2019, Vol 9, Issue 1, pN.PAG

2045-2322

Academic Journal

10.1038/s41598-019-54427-0