Diamagnetic d-orbitals Drive Magnetic Structure Selection in the Double Perovskite Ba${}_2$MnTeO${}_6$

Abstract

B-site ordered A${}_2$B'B''O${}_6$ double perovskites have a variety of applications as magnetic materials. Here we show that diamagnetic $d^{10}$ and $d^0$ B'' cations have a significant effect on the magnetic interactions in these materials. We present a neutron scattering and theoretical study of the Mn${}^{2+}$ double perovskite Ba${}_2$MnTeO${}_6$ with a $4d^{10}$ Te${}^{6+}$ cation on the B''-site. It is found to be a Type I antiferromagnet with a dominant nearest-neighbor $J_1$ interaction. In contrast, the $5d^0$ W${}^{6+}$ analogue Ba${}_2$MnWO${}_6$ is a Type II antiferromagnet with a significant next-nearest-neighbor $J_2$ interaction. This is due to a $d^{10}$/$d^0$ effect, where the different orbital hybridization with oxygen 2p results in different superexchange pathways. We show that $d^{10}$ B'' cations promote nearest neighbor and $d^0$ cations promote next-nearest-neighbor interactions. The $d^{10}$/$d^0$ effect could be used to tune magnetic interactions in double perovskites.

21+4 pages

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Cited by in corpus (1)

• Magnetic ordering and spin dynamics in $S=5/2$ staggered triangular lattice antiferromagnet Ba${}_2$MnTeO${}_6$