From Cooperative Paramagnet to Néel Order in Y_2Ru_2O_7
From Cooperative Paramagnet to Néel Order in Y_2Ru_2O_7
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从合作顺磁体到 Y_2Ru_2O_7 中的尼尔序
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
T. Perring
中科院分区：
文献类型：
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作者：
J. V. Duijn;N. Hur;Jon W. Taylor;Yiming Qiu;Q. Huang;S. Cheong;C. Broholm;T. Perring
烧绿石反铁磁体 ${mathrm{Y}}_{2}{mathrm{Ru}}_{2}{mathrm{O}}_{7}$ 与居里-魏斯温度 ${ensuremath{Theta}}_{CW}*ensuremath{-}1100phantom{ 的自旋相关性
ule{0.3em}{0ex}}mathrm{K}$ 和临界温度 ${T}_{N}=77phantom{
ule{0.3em}{0ex}}mathrm{K}$ 通过中子散射进行了检查。对于 ${T}_{N}lTl{ensuremath{Theta}}_{CW}∕3$，数据显示自旋弛豫速率为 $ensuremath{hbar}ensuremath{Gamma}=1.17(9){k}_{B}T$。对于 $Tl{T}_{N}$ 谱权重移动到更高的能量，变化幅度高达 $4{k}_{B}{T}_{N}$。对于$T⪡{T}_{N}$，有一个$ensuremath{Delta}=11(1)phantom{
ule{0.3em}{0ex}}mathrm{meV}$ 能隙和明显的光谱最大值 $19.7phantom{
ule{0.3em}{0ex}}mathrm{meV}$.在整个检查的温度范围内，非弹性散射的波矢量依赖性表现出 $Qdensuremath{approx}3.8$ 的宽峰（$d$ 是 $mathrm{Ru} ext{ensuremath{-}}mathrm{Ru}$ 间距），与偶极自旋相关性一致。
Spin correlations in the pyrochlore antiferromagnet ${mathrm{Y}}_{2}{mathrm{Ru}}_{2}{mathrm{O}}_{7}$ with Curie-Weiss temperature ${ensuremath{Theta}}_{CW}*ensuremath{-}1100phantom{
ule{0.3em}{0ex}}mathrm{K}$ and critical temperature ${T}_{N}=77phantom{
ule{0.3em}{0ex}}mathrm{K}$ were examined through neutron scattering. For ${T}_{N}lTl{ensuremath{Theta}}_{CW}∕3$ the data show spin relaxation with a rate $ensuremath{hbar}ensuremath{Gamma}=1.17(9){k}_{B}T$. For $Tl{T}_{N}$ spectral weight moves to higher energies with substantial changes up to $4{k}_{B}{T}_{N}$. For $T⪡{T}_{N}$ there is a $ensuremath{Delta}=11(1)phantom{
ule{0.3em}{0ex}}mathrm{meV}$ energy gap and a pronounced spectral maximum at $19.7phantom{
ule{0.3em}{0ex}}mathrm{meV}$. Throughout the temperature range examined, the wave vector dependence of inelastic scattering exhibits a broad peak for $Qdensuremath{approx}3.8$ ($d$ is the $mathrm{Ru} ext{ensuremath{-}}mathrm{Ru}$ spacing) consistent with dipolar spin correlations.