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- W2002128909 abstract "Neutron-diffraction measurements on ${mathrm{Er}}_{0.8}{R}_{0.2}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ $(R=mathrm{Tb},mathrm{Lu})$ and $mathrm{Er}{mathrm{Ni}}_{1.9}{mathrm{Co}}_{0.1}{mathrm{B}}_{2}mathrm{C}$ have been carried out to investigate the influence of chemical doping on the stability of the modulated states in $mathrm{Er}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$. Within the magnetically ordered phase and down to $1.6phantom{rule{0.3em}{0ex}}mathrm{K}$ (the lowest measured temperature), the powder diffractograms of Lu and Tb doped compounds are consistent with a transverse sine-modulated (fundamental) mode. A neutron diffraction study on a single-crystal ${mathrm{Er}}_{0.8}{mathrm{Lu}}_{0.2}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ recorded at $1.8phantom{rule{0.3em}{0ex}}mathrm{K}$ has confirmed the absence of higher order harmonics. In contrast, the low-temperature patterns of the Co doped compound reveal the presence of all the odd-order harmonics up to the fifth-order satellite, reminiscent of the structure of the undoped $mathrm{Er}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ below the weak-ferromagnetic transition point ${T}_{mathit{WF}}=2.1phantom{rule{0.3em}{0ex}}mathrm{K}$: a squared-up, noncompensated long-period antiferromagnetic state. The above-mentioned findings are consistent with the conclusions drawn from our previous specific-heat and magnetization measurements on the same compounds: on lowering the temperature further below ${T}_{N}$, both $mathrm{Er}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ and Co doped compounds undergo a spontaneous transition at ${T}_{mathit{WF}}$. In contrast, for the Lu and Tb doped compounds, no such second magnetic phase transition was observed down to $1phantom{rule{0.3em}{0ex}}mathrm{K}$; eventually the squaring-up of these structures, as required by entropy arguments, should occur but at temperatures lower than $1phantom{rule{0.3em}{0ex}}mathrm{K}$." @default.
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- W2002128909 date "2005-10-25" @default.
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- W2002128909 title "Stability of the modulated states in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Er</mml:mi><mml:msub><mml:mi mathvariant=normal>Ni</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>B</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>C</mml:mi></mml:mrow></mml:math>: A neutron diffraction study of chemically doped samples" @default.
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- W2002128909 doi "https://doi.org/10.1103/physrevb.72.144521" @default.
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