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• W2020301403 abstract "We have studied the wave-vector dependence of the magnetic excitation spectrum of Nd in ${mathrm{Nd}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Ce}}_{mathrm{x}}$${mathrm{CuO}}_{4}$n(x=0,0.13) and of Pr in ${mathrm{Pr}}_{1.86}$${mathrm{Ce}}_{0.14}$${mathrm{CuO}}_{4}$ by inelastic neutron-scattering experiments on single crystals. The results are analyzed with the help of model calculations which are performed in the context of the mean-field random-phase approximation. This enables us to obtain direct information on the coupling constants between the rare-earth ions. The exchange couplings between the Pr ions in ${mathrm{Pr}}_{1.86}$${mathrm{Ce}}_{0.14}$${mathrm{CuO}}_{4}$ turn out to be slightly reduced compared to the ones in the undoped parent compound ${mathrm{Pr}}_{2}$${mathrm{CuO}}_{4}$. In ${mathrm{Nd}}_{2}$${mathrm{CuO}}_{4}$ we observe a dependence of the coupling constants on the initial and final state that is involved in a crystal-field excitation. Furthermore our results indicate that the interaction of the Nd spins is opposite to the ordering enforced by the Nd-Cu exchange. We argue that this will lead to an instability of the Nd ordering in the Ce-doped systems which might be important for the onset of high ensuremath{gamma} values." @default.
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• W2020301403 date "1997-01-01" @default.
• W2020301403 modified "2023-10-16" @default.
• W2020301403 title "Neutron spectroscopy of 4f collective magnetic excitations in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>R</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=normal>x</mml:mi></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>…" @default.
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• W2020301403 doi "https://doi.org/10.1103/physrevb.55.1269" @default.
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