Type-II antiferromagnetic ordering in double perovskite oxide Sr${}_2$NiWO${}_6$

Abstract

Magnetic double perovskite compounds provide a fertile playground to explore interesting electronic and magnetic properties. By complementary macroscopic characterizations, neutron powder diffraction measurements and first-principles calculations, we have performed comprehensive studies on the magnetic ordering in the double perovskite compound Sr${}_2$NiWO${}_6$. It is found by neutron diffraction to order magnetically in a collinear type-II antiferromagnetic structure in a tetragonal lattice with $k$ = (0.5, 0, 0.5) below $T{}_{\mathrm{N}}$ = 56 K. In the ground state, the ordered moment of the spin-1 Ni${}^{2+}$ ions is determined to be 1.9(2) $\mu {}_{\mathrm{B}}$, indicating a significant quenching of the orbital moment. The Ni${}^{2+}$ moments in Sr${}_2$NiWO${}_6$ are revealed to cant off the $c$ axis by 29.2${}^{\circ }$, which is well supported by the first-principles magnetic anisotropy energy calculations. Furthermore, the in-plane and out-of-plane next-nearest-neighbor superexchange couplings ($J{}_2$ and $J{}_{2c}$) are found to play a dominant role in the spin Hamiltonian of Sr${}_2$NiWO${}_6$, which accounts for the stabilization of the type-II AFM structure as its magnetic ground state.

10 Pages, 6 figures, accepted for publication in Physical Review B

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Cited by in corpus (1)

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