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Condensed Matter > Strongly Correlated Electrons
Title: Type-II antiferromagnetic ordering in double perovskite oxide Sr$_2$NiWO$_6$
(Submitted on 25 Mar 2023 (v1), last revised 1 Aug 2023 (this version, v2))
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 $T\rm_N$ = 56 K. In the ground state, the ordered moment of the spin-1 Ni$^{2+}$ ions is determined to be 1.9(2) $\mu\rm_{B}$, 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 ($J\rm_2$ and $J\rm_{2c}$) 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.
Submission history
From: Wentao Jin Prof. [view email][v1] Sat, 25 Mar 2023 06:11:46 GMT (12777kb,D)
[v2] Tue, 1 Aug 2023 03:47:29 GMT (12781kb,D)
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