Structure, spin correlations and magnetism of the $S = 1/2$ square-lattice antiferromagnet Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ ($0 \leq x \leq 1$)
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913189973721088 |
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| author | Mustonen, Otto H. J. Fogh, Ellen Paddison, Joseph A. M. Mangin-Thro, Lucile Hansen, Thomas Playford, Helen Diaz-Lopez, Maria Babkevich, Peter Vasala, Sami Karppinen, Maarit Cussen, Edmund J. Rønnow, Henrik M. Walker, Helen C. |
| author_facet | Mustonen, Otto H. J. Fogh, Ellen Paddison, Joseph A. M. Mangin-Thro, Lucile Hansen, Thomas Playford, Helen Diaz-Lopez, Maria Babkevich, Peter Vasala, Sami Karppinen, Maarit Cussen, Edmund J. Rønnow, Henrik M. Walker, Helen C. |
| contents | Quantum spin liquids are highly entangled magnetic states with exotic properties. The $S = 1/2$ square-lattice Heisenberg model is one of the foundational models in frustrated magnetism with a predicted, but never observed, quantum spin liquid state. Isostructural double perovskites Sr$_2$CuTeO$_6$ and Sr$_2$CuWO$_6$ are physical realizations of this model, but have distinctly different types magnetic order and interactions due to a $d^{10}/d^0$ effect. Long-range magnetic order is suppressed in the solid solution Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ in a wide region of $x = 0.05-0.6$, where the ground state has been proposed to be a disorder-induced spin liquid. Here we show that the spin-liquid-like $x = 0.2$ and $x = 0.5$ samples have distinctly different local spin correlations, which suggests they have different ground states. Furthermore, the previously ignored interlayer coupling between the square-planes is likely to play a role in the suppression of magnetic order on the W-rich side at $x \approx 0.6$. These results highlight the complex magnetism of Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ and hint at a new quantum critical point at $x \approx 0.3$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_14422 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Structure, spin correlations and magnetism of the $S = 1/2$ square-lattice antiferromagnet Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ ($0 \leq x \leq 1$) Mustonen, Otto H. J. Fogh, Ellen Paddison, Joseph A. M. Mangin-Thro, Lucile Hansen, Thomas Playford, Helen Diaz-Lopez, Maria Babkevich, Peter Vasala, Sami Karppinen, Maarit Cussen, Edmund J. Rønnow, Henrik M. Walker, Helen C. Strongly Correlated Electrons Materials Science Quantum spin liquids are highly entangled magnetic states with exotic properties. The $S = 1/2$ square-lattice Heisenberg model is one of the foundational models in frustrated magnetism with a predicted, but never observed, quantum spin liquid state. Isostructural double perovskites Sr$_2$CuTeO$_6$ and Sr$_2$CuWO$_6$ are physical realizations of this model, but have distinctly different types magnetic order and interactions due to a $d^{10}/d^0$ effect. Long-range magnetic order is suppressed in the solid solution Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ in a wide region of $x = 0.05-0.6$, where the ground state has been proposed to be a disorder-induced spin liquid. Here we show that the spin-liquid-like $x = 0.2$ and $x = 0.5$ samples have distinctly different local spin correlations, which suggests they have different ground states. Furthermore, the previously ignored interlayer coupling between the square-planes is likely to play a role in the suppression of magnetic order on the W-rich side at $x \approx 0.6$. These results highlight the complex magnetism of Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ and hint at a new quantum critical point at $x \approx 0.3$. |
| title | Structure, spin correlations and magnetism of the $S = 1/2$ square-lattice antiferromagnet Sr$_2$CuTe$_{1-x}$W$_x$O$_6$ ($0 \leq x \leq 1$) |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2309.14422 |