Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr$_{1-x}$Ca$_x$NiReO$_6$

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

paper

Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr $_{1 - x}$ Ca $_{x}$ NiReO $_{6}$

arXiv:1810.10995

Abstract

The magnetic ground state in highly ordered double perovskites LaSr $_{1 - x}$ Ca $_{x}$ NiReO $_{6}$ ( $x$ = 0.0, 0.5, 1.0) were studied in view of the Goodenough-Kanamori rules of superexchange interactions. In LaSrNiReO $_{6}$ , Ni and Re sublattices are found to exhibit curious magnetic states, but do not show any long range magnetic ordering. The magnetic transition at $\sim$ 255 K is identified with the Re sublattic magnetic ordering. The sublattice interactions are tuned by modifying the Ni-O-Re bond angles via changing the lattice structure 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 reveals a canted alignment between the Ni and the Re sublattices, while the individual sublattice is ferromagnetic. The transition temperature of the ferrimagnetic phase increases monotonically with increasing Ca concentration.

18 pages, 8 figures

Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr1−x​Cax​NiReO6​

Abstract

Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr $_{1 - x}$ Ca $_{x}$ NiReO $_{6}$