Fe2 +配位聚合物中自旋态涨落引起的光谱敏感声子消失
Spectral sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer
摘要：
在自旋交叉系统[Fe（pmd）（H2O）{Au（CN）2}2]*H2O中的拉曼散射揭示了一个复杂的三相自旋态转变，与先前在磁化测量中的观察相反。我们观察到不同的自旋态相位作为温度和电磁辐射在可见光谱范围内的函数。存在一个自旋态的涨落相位，并伴随着低频声子散射强度的意外消失。此外，我们观察到一个阶段，减少对称性，这是由于合作Jahn-Teller效应。显著的电子-声子相互作用表现为与{FeN 6}和{FeN 4 O2}配位八面体相关的声子的强Fano共振。密度泛函理论支持这种解释。
英文摘要：
Raman scattering in the spin-crossover system [Fe(pmd)(H2O){Au(CN)2}2]*H2O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin state phases as function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin state phase with an unexpected wipeout of the low frequency phonon scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano-resonance of phonons related to {FeN6} and {FeN4O2} coordination octahedra. Density functional theory supports this interpretation.
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