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• W2013090733 abstract "Neutron scattering has been used to investigate the magnetic ordering of the Dy ions in the superconducting (${mathit{T}}_{mathit{c}}$ensuremath{approxeq}60 K) ${mathrm{Dy}}_{2}$${mathrm{Ba}}_{4}$${mathrm{Cu}}_{7}$${mathrm{O}}_{15}$ (2:4:7) material. A modulated saw-tooth scattering profile is observed, indicative of a coupled-bilayer two-dimensional (2D) system in which the nearest-neighbor Dy spins within the a-b plane are coupled antiferromagnetically, with the moment direction along the c axis. The a-b-plane spin configuration is identical to the one which has been observed for the related ${mathrm{DyBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$ (1:2:3) and ${mathrm{Dy}}_{2}$${mathrm{Ba}}_{4}$${mathrm{Cu}}_{8}$${mathrm{O}}_{16}$ (2:4:8) materials. The N'eel temperature in the present system is found to be ensuremath{sim}1.3 K, while no three-dimensional (3D) long-range order is seen to the lowest temperature measured (ensuremath{sim}90 mK). The 2D behavior of this system originates from two sources. First, the c-axis spacing of the magnetic ions is ensuremath{sim}3 times the a-b spacing, and this structural anisotropy renders the c-axis interaction much weaker than the interactions within the a-b plane. Indeed we find that the calculated dipolar interaction between layers varies exponentially with distance, and is reduced by a factor of 7000 compared with the intralayer interactions. Second, every other a-b layer is shifted along the b axis by b/2, which causes a cancellation of the magnetic interplane interactions between the shifted and unshifted layers. Hence the magnetic system consists of sets of isolated bilayers. We anticipate that a similar coupled-bilayer 2D behavior should occur in other ${mathit{scrR}}_{2}$${mathrm{Ba}}_{4}$${mathrm{Cu}}_{7}$${mathrm{O}}_{15}$ systems (scrR= rare-earth element, except Er) which exhibit the same a-b-plane spin configuration as the Dy." @default.
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• W2013090733 title "Coupled-bilayer two-dimensional magnetic order of the Dy ions in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Dy</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></…" @default.
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• W2013090733 doi "https://doi.org/10.1103/physrevb.45.10022" @default.
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