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- W1982342533 abstract "Magnetic-susceptibility measurements have been performed on single crystals of the quasi-one-dimensional system ${mathrm{CuGe}}_{1ensuremath{-}x}{mathrm{Si}}_{x}{mathrm{O}}_{3},$ for a large number of $x$ values $(0<~x<~0.1)$ and down to very low temperatures $(70mathrm{mK}<~T<~20mathrm{K}).$ Si doping has three major effects: The drastic destruction of the spin-Peierls phase, the appearance at low temperature of a three-dimensional antiferromagnetic order, and the freeing of some $S=$$frac{1}{2}$ spins. We have studied in detail the temperature dependence of the susceptibility in order to determine, in the low-temperature range, the proportion of free spins (i.e., paramagnetic) and the proportion of spins being in the spin-Peierls state. A quite complete $(T,x)$ phase diagram and its qualitative interpretation are given. We have also carried out field-dependent susceptibility measurements in the antiferromagnetic phase to study the spin-flop transition. The spin-flop field varies between 1 and 15 kOe depending on the N'eel temperature of the sample. A $(H,T)$ phase diagram is given for several Si-doping levels." @default.
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- W1982342533 date "1998-02-01" @default.
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- W1982342533 title "Magnetic susceptibility and phase diagram of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuGe</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Si</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>…" @default.
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- W1982342533 doi "https://doi.org/10.1103/physrevb.57.3444" @default.
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