Magnetic Structure of the $S=1/2$ Quasi-Two-Dimensional Square-Lattice Heisenberg Antiferromagnet Sr${}_2$CuTeO${}_6$

Abstract

The magnetic structure of the double perovskite compound Sr${}_2$CuTeO${}_6$ was determined from neutron powder diffraction data. This material is magnetically described as an $S=1/2$ quasi-two-dimensional square-lattice Heisenberg model with antiferromagnetic nearest-neighbor and next-nearest-neighbor interactions. Sr${}_2$CuTeO${}_6$ undergoes a magnetic phase transition at $T_{\mathrm{N}}\simeq 29$ K. The spin structure below $T_{\mathrm{N}}$ is Néel antiferromagnetic on the square lattice, which means that the nearest-neighbor interaction ($J_1$) is stronger than the next-nearest-neighbor interaction ($J_2$), in contrast to other isostructural compounds such as Ba${}_2$CuWO${}_6$ and Sr${}_2$CuWO${}_6$, for which $|J_1|<|J_2|$ is realized.

arXiv comment6 pages, 7 figures, to appear in Phys. Rev. B

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