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• W2615496992 abstract "We report neutron scattering measurements on ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$, a new addition to the $XY$ family of frustrated pyrochlore magnets. Symmetry analysis of our elastic scattering data shows that ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$ orders into the $k=0$, ${mathrm{ensuremath{Gamma}}}_{7}$ magnetic structure (the Palmer-Chalker state), at ${T}_{N}=0.38text{ }text{ }mathrm{K}$. This contrasts with its sister $XY$ pyrochlore antiferromagnets ${mathrm{Er}}_{2}{mathrm{Ti}}_{2}{mathrm{O}}_{7}$ and ${mathrm{Er}}_{2}{mathrm{Ge}}_{2}{mathrm{O}}_{7}$, both of which order into ${mathrm{ensuremath{Gamma}}}_{5}$ magnetic structures at much higher temperatures, ${T}_{N}=1.2$ and 1.4 K, respectively. In this temperature range, the magnetic heat capacity of ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$ contains a broad anomaly centered at ${T}^{*}=1.5text{ }text{ }mathrm{K}$. Our inelastic neutron scattering measurements reveal that this broad heat capacity anomaly sets the temperature scale for strong short-range spin fluctuations. Below ${T}_{N}=0.38text{ }text{ }mathrm{K}$, ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$ displays a gapped spin-wave spectrum with an intense, flat band of excitations at lower energy and a weak, diffusive band of excitations at higher energy. The flat band is well described by classical spin-wave calculations, but these calculations also predict sharp dispersive branches at higher energy, a striking discrepancy with the experimental data. This, in concert with the strong suppression of ${T}_{N}$, is attributable to enhanced quantum fluctuations due to phase competition between the ${mathrm{ensuremath{Gamma}}}_{7}$ and ${mathrm{ensuremath{Gamma}}}_{5}$ states that border each other within a classically predicted phase diagram." @default.
• W2615496992 created "2017-05-26" @default.
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• W2615496992 date "2017-10-30" @default.
• W2615496992 modified "2023-10-16" @default.
• W2615496992 title "Phase Competition in the Palmer-Chalker <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>X</mml:mi><mml:mi>Y</mml:mi></mml:math> Pyrochlore <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>Er</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Pt</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant=…" @default.
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• W2615496992 doi "https://doi.org/10.1103/physrevlett.119.187201" @default.
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