Magnetic interactions in the $S=1/2$ square-lattice antiferromagnets Ba${}_2$CuTeO${}_6$ and Ba${}_2$CuWO${}_6$: parent phases of a possible spin liquid

Abstract

The isostructural double perovskites Ba${}_2$CuTeO${}_6$ and Ba${}_2$CuWO${}_6$ are shown by theory and experiment to be frustrated square-lattice antiferromagnets with opposing dominant magnetic interactions. This is driven by differences in orbital hybridisation of Te${}^{6+}$ and W${}^{6+}$. A spin-liquid-like ground state is predicted for Ba${}_2$Cu(Te${}_{1-x}$W${}_x$)O${}_6$ solid solution similar to recent observations in Sr${}_2$Cu(Te${}_{1-x}$W${}_x$)O${}_6$.

4+4 pages, 3+2 figures

References in corpus (1)

• Tuning the magnetic exchange via a control of orbital hybridization in Cr2(Te1-xWx)O6

Cited by in corpus (8)

• Diamagnetic d-orbitals Drive Magnetic Structure Selection in the Double Perovskite Ba${}_2$MnTeO${}_6$
• Long and short range magnetism in the frustrated double perovskite Ba2MnWO6
• Site-selective $d^{10}$/$d^0$ substitution in a $S=1/2$ spin ladder Ba${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$ ($0\le x\le 0.3$)
• Randomness and Frustration in a S = 1/2 Square-Lattice Heisenberg Antiferromagnet
• Realising square and diamond lattice $S=1/2$ Heisenberg antiferromagnet models in the $\alpha$ and $\beta$ phases of the coordination framework, KTi(C${}_2$O${}_4$)${}_2\cdot$\textit{x}H${}_2$O
• Structure, spin correlations and magnetism of the $S=1/2$ square-lattice antiferromagnet Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$ ($0\le x\le 1$)
• Fractional corner magnetization of collinear antiferromagnets
• Emergent Half Metal at Finite Temperatures in a Mott Insulator