Dynamical structure in liquid Te using inelastic x-ray scattering: from semiconductor-metal transition to metallic regime
Dynamical structure in liquid Te using inelastic x-ray scattering: from semiconductor-metal transition to metallic regime
复制标题
使用非弹性 X 射线散射研究液态 Te 中的动态结构：从半导体-金属转变到金属状态
DOI：
10.1088/1742-6596/98/2/022001
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Baron
中科院分区：
文献类型：
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作者：
Y. Kajihara;M. Inui;S. Hosokawa;K. Matsuda;A. Baron
我们在日本SPring-8进行了液体Te的非弹性x射线散射测量，得到了液体Te在500、650和800°C时的动态结构因子S(Q，W)， Q范围为1.3 ~ 43 nm1，W范围为-40 ~ 40 meV。确定了每个S（Q，W）的集体激励。激励模式的动态速度vQ随温度的升高而减小，这是正常的，但与超声声速vs随温度异常升高的行为相矛盾。这一矛盾意味着超声异常不是由该q区动力学引起的，存在更大尺寸（>几nm）的结构松弛过程。“正色散”的值（≡(vQ - vs)/vs）从500℃时的70%下降到800℃时的15%。在其他液体（如超临界汞）中，在非金属-金属转变状态下也观察到较大的正色散，这意味着这是非金属-金属转变的常见现象。
We have carried out inelastic x-ray scattering measurements of liquid Te at SPring-8 in Japan and obtained the dynamic structure factors S(Q,W) at 500, 650 and 800°C in Q-range from 1.3 to 43 nm1 and W-range from -40 to 40 meV, respectively. Collective excitation is ascertained in each S(Q,W). Dynamical velocity vQ of the excitation mode decreases with increasing temperature, which is normal but contradicts to the behaviour of the ultrasonic sound velocity vs that anomalously increases against temperature. This contradiction means that the ultrasonic anomaly is not derived from the dynamics in this Q-region and larger-size (> a few nm) structural relaxation process exists. The value of "positive dispersion" (≡ (vQ - vs)/vs) decreases from 70% at 500°C to 15% at 800°C. Large positive dispersion is also observed at the nonmetal-metal transition regime in other liquids such as supercritical Hg, which imply that this is a common phenomenon concerning with nonmetal-metal transition.
通过中子散射测量液态 Se、Te 和 Se-Te 混合物的动态结构
DOI：
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发表时间：
2004
期刊：
AIP Conf. Proc. "Slow Dynamics in Complex Systems" 708
影响因子：
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作者：
A.Chiba;M.Yao;Y.Ohmasa;J.Taylor;S.M.Bennington
通讯作者：
S.M.Bennington