FeTe磷属元素化物中的反常光学声子：自旋态、磁序和晶格非谐性
Anomalous optical phonons in FeTe pnictides: spin state, magnetic order, and lattice anharmonicity
摘要：
研究了非超导单晶FeTe的偏振拉曼散射谱随温度的变化。我们发现了有序磁矩的大小与低温下A1 g声子的线宽之间的关系。这种关系归因于Fe离子的中间自旋态（S=1）和轨道简并度。利用密度泛函理论和局域自旋密度分析的微观模型，估算了自旋-声子耦合常数。我们的观测表明轨道自由度对于具有大有序磁矩的铁基超导体的重要性，而某些铁磷属元素化物中Fe离子的小磁矩则反映了这些体系中Fe离子的低自旋态.
英文摘要：
Polarized Raman-scattering spectra of non-superconducting, single-crystalline FeTe are investigated as function of temperature. We have found a relation between the magnitude of ordered magnetic moments and the linewidth of A1g phonons at low temperatures. This relation is attributed to the intermediate spin state (S=1) and the orbital degeneracy of the Fe ions. Spin-phonon coupling constants have been estimated based on microscopic modeling using density-functional theory and analysis of the local spin density. Our observations show the importance of orbital degrees of freedom for the Fe-based superconductors with large ordered magnetic moments, while small magnetic moment of Fe ions in some iron pnictides reflects the low spin state of Fe ions in those systems.
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