Antiferromagnetic long-range order inCu 1 − x Zn x GeO
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We have measured the magnetic susceptibilities of single crystals of ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x}{\mathrm{GeO}}_{3}$ with extremely low Zn concentration $(x)$ lower than $x=5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ at very low temperatures to investigate the spin-Peierls and antiferromagnetic transitions. The results show that the undoped ${\mathrm{CuGeO}}_{3}$ has no antiferromagnetic phase down to 12 mK and there exists an antiferromagnetic long-range order with the easy axis along the $c$ axis for $x$ down to $1.12(2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$ The minimum observed N\'eel temperature was 0.0285 K for the $x=1.12(2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ sample. From the concentration dependence of the N\'eel temperature it is concluded that there is no critical concentration for the occurrence of the antiferromagnetic long-range order. This indicates that the dimerization sustains the coherence of the antiferromagnetic phase of the spin polarization in impurity-doped systems and is consistent with the theory of the impurity-doped spin-Peierls system. The temperature dependence of the susceptibilities at $T>{T}_{N}$ of all samples indicates that the magnetic correlations between localized spins are enhanced by a relatively large interchain interaction of ${\mathrm{CuGeO}}_{3}.$Keywords:
Néel temperature
Atmospheric temperature range
We describe some antiferromagnetic systems which exhibit spin gaps. We also discuss the effect of doping one such system, namely, the spin-ladders, with holes. Some model antiferromagnetic systems with spin gap are reviewed for which exact results are available. Exact results for a doped spin-ladder model are also mentioned.
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Low-temperature (0.05K
Néel temperature
Geometrical frustration
Lattice (music)
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We have measured the magnetic susceptibilities of single crystals of ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x}{\mathrm{GeO}}_{3}$ with extremely low Zn concentration $(x)$ lower than $x=5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ at very low temperatures to investigate the spin-Peierls and antiferromagnetic transitions. The results show that the undoped ${\mathrm{CuGeO}}_{3}$ has no antiferromagnetic phase down to 12 mK and there exists an antiferromagnetic long-range order with the easy axis along the $c$ axis for $x$ down to $1.12(2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}.$ The minimum observed N\'eel temperature was 0.0285 K for the $x=1.12(2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ sample. From the concentration dependence of the N\'eel temperature it is concluded that there is no critical concentration for the occurrence of the antiferromagnetic long-range order. This indicates that the dimerization sustains the coherence of the antiferromagnetic phase of the spin polarization in impurity-doped systems and is consistent with the theory of the impurity-doped spin-Peierls system. The temperature dependence of the susceptibilities at $T>{T}_{N}$ of all samples indicates that the magnetic correlations between localized spins are enhanced by a relatively large interchain interaction of ${\mathrm{CuGeO}}_{3}.$
Néel temperature
Atmospheric temperature range
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Hematite (α-Fe2O3) is an antiferromagnetic material with a very low spin damping and high Néel temperature. The temperature dependence of the antiferromagnetic resonance in a bulk single crystal of hematite was characterized from room temperature up to the Néel temperature in the frequency range of 0.19–0.5 THz. From these data, the Néel temperature was estimated as 966 K.
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The magnetic structure of Cr fine particles was studied by neutron diffraction. In contrast to the incommensurate spin-density wave (SDW) of the bulk Cr, a simple antiferromagnetic structure is stabilized in the whole temperature range below the Neel temperature probably due to a size effect. The results are compared with the case of the SDW in gamma -Fe precipitates in Cu.
Néel temperature
Spin density wave
Magnetic structure
Atmospheric temperature range
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In this paper we developed a theory for the effect of antiferromagnetic spin fluctuations on the uniform spin susceptibility. Our theoretical analysis suggests strongly that the effect of the antiferromagnetic spin fluctuations on the uniform spin susceptibility is the origin of the temperature dependence of the uniform spin susceptibility in high-Tc superconductors.
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Néel temperature
Solid-state physics
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U2T2X compounds (Mo2FeB2 structure type, T - transition metal, X - p-element), exhibiting wide range of magnetic properties from weak paramagnetism to 5f-antiferromagnetism, have been checked for hydrogen absorbtion properties. Besides U2Co2Sn hydrides, which have already been reported, U2Ni2SnH1.8, U2Ni2InH1.9, U2Co2InH1.9, and U2Fe2SnH1.9, have been synthesized. Hydrogenation leads to the enhancement of magnetic interaction for all compounds. U2Ni2SnH1.8 and U2Ni2InH1.9 order antiferromagnetically similar to the initial compounds, and the Neel temperature increases from 26 K to 87 K and from 15 K to 60 K, respectively.
Magnetism
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We studied the effect of doping on the antiferromagnetism.The Neel temperature TN decays rapidly with the increasing of the doping concentration x.And the Neel temperature will get to zero when it reach the critical concentration.It means the antiferromagnetic long range order is destroyed completely.We can find the effect of doping has connection with the number of the layer.We will study it theoretically.
Néel temperature
Atmospheric temperature range
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