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Instruments / Technical Area	Publication Details	Published	Actions
I15-1-X-ray Pair Distribution Function (XPDF)	Structure, spin correlations, and magnetism of the S = 1/2 square-lattice antiferromagnet Sr2CuTe1–xWxO6 (0 ≤ x ≤ 1) Otto H. J. Mustonen , Ellen Fogh , Joseph A. M. Paddison , Lucile Mangin-Thro , Thomas Hansen , Helen Y. Playford , Maria Diaz-Lopez , Peter Babkevich , Sami Vasala , Maarit Karppinen , Edmund J. Cussen , Henrik M. Ronnow , Helen C. Walker Chemistry Of Materials 43 DOI: 10.1021/acs.chemmater.3c02535 Diamond Proposal Number(s): [21802] Open Access Show Abstract ▼ Abstract: 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 Sr2CuTeO6 and Sr2CuWO6 are physical realizations of this model but have distinctly different types of magnetic order and interactions due to a d10/d0 effect. Long-range magnetic order is suppressed in the solid solution Sr2CuTe1–xWxO6 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 present a comprehensive neutron scattering study of this system. We show using polarized neutron scattering that the spin liquid-like x = 0.2 and x = 0.5 samples have distinctly different local spin correlations, which suggests that they have different ground states. Low-temperature neutron diffraction measurements of the magnetically ordered W-rich samples reveal magnetic phase separation, which suggests that the previously ignored interlayer coupling between the square planes plays a role in the suppression of magnetic order at x ≈ 0.6. These results highlight the complex magnetism of Sr2CuTe1–xWxO6 and hint at a new quantum critical point between 0.2 < x < 0.4.	Dec 2023
	Role of defects in determining the magnetic ground state of ytterbium titanate D. F. Bowman , E. Cemal , T. Lehner , A. R. Wildes , L. Mangin-Thro , G. J. Nilsen , M. J. Gutmann , D. J. Voneshen , D. Prabhakaran , A. T. Boothroyd , D. G. Porter , C. Castelnovo , K. Refson , J. P. Goff Nature Communications 10 DOI: 10.1038/s41467-019-08598-z Open Access Show Abstract ▼ Abstract: Pyrochlore systems are ideally suited to the exploration of geometrical frustration in three dimensions, and their rich phenomenology encompasses topological order and fractional excitations. Classical spin ices provide the first context in which it is possible to control emergent magnetic monopoles, and anisotropic exchange leads to even richer behaviour associated with large quantum fluctuations. Whether the magnetic ground state of Yb2Ti2O7 is a quantum spin liquid or a ferromagnetic phase induced by a Higgs transition appears to be sample dependent. Here we have determined the role of structural defects on the magnetic ground state via the diffuse scattering of neutrons. We find that oxygen vacancies stabilise the spin liquid phase and the stuffing of Ti sites by Yb suppresses it. Samples in which the oxygen vacancies have been eliminated by annealing in oxygen exhibit a transition to a ferromagnetic phase, and this is the true magnetic ground state.	Feb 2019

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