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.

arXiv comment18 pages, 8 figures

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

Abstract

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