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- W2767944438 abstract "The pyrochlore magnet ${mathrm{Yb}}_{2}{mathrm{Ti}}_{2}{mathrm{O}}_{7}$ has been proposed as a quantum spin ice candidate, a spin liquid state expected to display emergent quantum electrodynamics with gauge photons among its elementary excitations. However, ${mathrm{Yb}}_{2}{mathrm{Ti}}_{2}{mathrm{O}}_{7}$'s ground state is known to be very sensitive to its precise stoichiometry. Powder samples, produced by solid-state synthesis at relatively low temperatures, tend to be stoichiometric, while single crystals grown from the melt tend to display weak ``stuffing'' wherein $ensuremath{sim}2%$ of the ${mathrm{Yb}}^{3+}$, normally at the $A$ site of the ${A}_{2}{B}_{2}{text{O}}_{7}$ pyrochlore structure, reside as well at the $B$ site. In such samples ${mathrm{Yb}}^{3+}$ ions should exist in defective environments at low levels and be subjected to crystalline electric fields very different from those at the stoichiometric $A$ sites. Neutron scattering measurements of ${mathrm{Yb}}^{3+}$ in four compositions of ${mathrm{Yb}}_{2+x}{mathrm{Ti}}_{2ensuremath{-}x}{mathrm{O}}_{7ensuremath{-}y}$ show the spectroscopic signatures for these defective ${mathrm{Yb}}^{3+}$ ions and explicitly demonstrate that the spin anisotropy of the ${mathrm{Yb}}^{3+}$ moment changes from $XY$-like for stoichiometric ${mathrm{Yb}}^{3+}$ to Ising-like for ``stuffed'' $B$ site ${mathrm{Yb}}^{3+}$ or for $A$ site ${mathrm{Yb}}^{3+}$ in the presence of oxygen vacancies." @default.
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- W2767944438 date "2018-06-11" @default.
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- W2767944438 title "Crystal field excitations from<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msup><mml:mrow><mml:mi>Yb</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>ions at defective sites in highly stuffed<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Yb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>7…" @default.
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- W2767944438 doi "https://doi.org/10.1103/physrevb.97.224409" @default.
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