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Valence bond glass state in the 4$d^1$ fcc antiferromagnet Ba$_2$LuMoO$_6$

Autor: Mustonen, O., Mutch, H., Walker, H. C., Baker, P. J., Coomer, F. C., Perry, R. S., Pughe, C., Stenning, G. B. G., Liu, C., Dutton, S. E., Cussen, E. J.

Publikováno v: npj Quantum Mater. 7, 74 (2022)

$B$-site ordered 4$d^1$ and 5$d^1$ double perovskites have a number of potential novel ground states including multipolar order, quantum spin liquids and valence bond glass states. These arise from the complex interactions of spin-orbital entangled $

Externí odkaz: http://arxiv.org/abs/2108.02209

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Exchange Interactions Mediated by Non-Magnetic Cations in Double Perovskites

Autor: Katukuri, Vamshi M., Babkevich, P., Mustonen, O., Walker, H. C., Fåk, B., Vasala, S., Karppinen, M., Rønnow, H. M., Yazyev, O. V.

Publikováno v: Phys. Rev. Lett. 124, 077202 (2020)

Establishing the physical mechanism governing exchange interactions is fundamental for exploring exotic phases such as the quantum spin liquids (QSLs) in real materials. In this work, we address exchange interactions in Sr2CuTe$_{1-x}$W$_{x}$O, a ser

Externí odkaz: http://arxiv.org/abs/1902.09376

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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

Autor: Mustonen, O., Vasala, S., Mutch, H., Thomas, C. I., Stenning, G. B. G., Baggio-Saitovitch, E., Cussen, E. J., Karppinen, M.

Publikováno v: Chem. Commun. 55, 1132 (2019)

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 hybridi

Externí odkaz: http://arxiv.org/abs/1812.05619

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Tuning the $S = 1/2$ square-lattice antiferromagnet Sr$_2$Cu(Te$_{1-x}$W$_x$)O$_6$ from N\'eel order to quantum disorder to columnar order

Autor: Mustonen, O., Vasala, S., Schmidt, K. P., Sadrollahi, E., Walker, H. C., Terasaki, I., Litterst, F. J., Baggio-Saitovitch, E., Karppinen, M.

Publikováno v: Phys. Rev. B 98, 064411 (2018)

The spin-1/2 square-lattice Heisenberg model is predicted to have a quantum disordered ground state when magnetic frustration is maximized by competing nearest-neighbor $J_1$ and next-nearest-neighbor $J_2$ interactions ($J_2/J_1 \approx 0.5$). The d

Externí odkaz: http://arxiv.org/abs/1804.08630

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Spin-liquid-like state in a spin-1/2 square-lattice antiferromagnet perovskite induced by $d^{10}$-$d^0$ cation mixing

Autor: Mustonen, O., Vasala, S., Sadrollahi, E., Schmidt, K. P., Baines, C., Walker, H. C., Terasaki, I., Litterst, F. J., Baggio-Saitovitch, E., Karppinen, M.

Publikováno v: Nat. Commun. 9 (2018) 1085

A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-lattice antiferromagnets at the boundary region between N\'eel (nearest-neighbor interaction dominates) and columnar (next-nearest-neighbor dominates) antiferr

Externí odkaz: http://arxiv.org/abs/1802.04805

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Spin wave excitations in the tetragonal double perovskite Sr$_2$CuWO$_6$

Autor: Walker, H. C., Mustonen, O., Vasala, S., Adroja, D. T., Karppinen, M.

Sr$_2$CuWO$_6$ is a double perovskite proposed to be at the border between two and three dimensional magnetism, with a square lattice of $S=\frac{1}{2}$ Cu$^{2+}$ ions. We have used inelastic neutron scattering to investigate the spin wave excitation

Externí odkaz: http://arxiv.org/abs/1602.03335

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