Cooperative Configuration Change in EuPd 2 Si 2
Cooperative Configuration Change in EuPd 2 Si 2
复制标题
EuPd 2 Si 2 的协同构型变化
DOI：
10.1103/physrevlett.48.826
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发表时间：
1982
影响因子：
8.6
通讯作者：
L. C. Gupta
中科院分区：
文献类型：
--
作者：
M. Croft;J. Hodges;E. Kemly;A. Krishnan;V. Murgai;L. C. Gupta
Eu${\mathrm{Pd}}_{2}$${\mathrm{Si}}_{2}$ 中的 $4{f}^{7}\ensuremath{\rightleftarrows}4{f}^{6}+e$ 电荷波动（从 $^{151}\mathrm{Eu}$ M\"ossbauer 光谱推断）与在稀 Eu 中观察到的电荷波动相比，表现出强烈的非线性热依赖性La${\mathrm{Pd}}_{2}$${\mathrm{Si}}_{2}$ 通过扩展互配置波动模型来很好地描述这种非线性行为，将互配置波动激发能量与发生在最大电荷不稳定区域的 $4f$ 占据数进行协同位点耦合。
$4{f}^{7}\ensuremath{\rightleftarrows}4{f}^{6}+e$ charge fluctuations (inferered from $^{151}\mathrm{Eu}$ M\"ossbauer spectroscopy) in Eu${\mathrm{Pd}}_{2}$${\mathrm{Si}}_{2}$ show a strong nonlinear thermal dependence when compared to those observed in dilute Eu in La${\mathrm{Pd}}_{2}$${\mathrm{Si}}_{2}$. This nonlinear behavior is well described by extending the interconfigurational fluctuation model to include a cooperative intersite coupling of the interconfigurational fluctuation excitation energy to the $4f$ occupation number. Eu nuclear vibrational damping occurs in the region of greatest charge instability.