电荷密度波材料 BaFe₂Al₉ 的偏振和变温拉曼光谱研究

Polarized and Temperature-Dependent Raman Spectroscopy Study of the Charge-Density-Wave Material BaFe₂Al₉

摘要

BaFe₂Al₉作为富铝金属间化合物AM₂Al₉家族中的一员,因其具有反常的电荷密度波(CDW)而备受关注.本文利用拉曼光谱技术对三维CDW材料BaFe₂Al₉不同特征面的声子模式进行了系统研究.角度依赖的偏振拉曼光谱实验表明,室温下ab特征面可观测到3个拉曼峰,均归属于E_2g振动模式,而bc特征面可观测到4个拉曼峰,包含3个E_2g振动模式和1个E_1g振动模式.变温拉曼光谱结果显示,在CDW的转变温度附近未观测到相关的晶格动力学信号,暗示BaFe₂Al₉中的CDW主要由电子驱动.本研究对BaFe₂Al₉的声子振动模式进行了全面且详细的解析,为探究CDW起源及其与声子振动模式之间的内在联系提供了重要参考.

Abstract

As a member of the Al-rich intermetallic compound family AM₂Al₉, BaFe₂Al₉ has attracted considerable attention due to its unusual charge density wave (CDW). In this work, the phonon modes on different characteristic planes of the three-dimensional CDW material BaFe₂Al₉ are systematically investigated using Raman spectroscopy. Angle-dependent polarized Raman spectroscopy experiments reveal that three Raman peaks can be observed on the ab characteristic plane at room temperature, all of which are assigned to the E_2g vibration mode. On the bc characteristic plane, four Raman peaks are observed, including three E_2g modes and one E_1g mode. Temperature-dependent Raman spectroscopy results show that no associated lattice dynamics signals are observed near the CDW transition temperature, suggesting that the CDW in BaFe₂Al₉ is primarily electron-driven. This study provides a comprehensive and detailed analysis of the phonon vibration modes in BaFe₂Al₉, offering important insights into the origin of the CDW and its intrinsic relationship with the phonon vibration modes.

关键词

拉曼光谱 / BaFe₂Al₉ / 富铝金属间化合物 / 电荷密度波

Key words

Raman spectroscopy / BaFe₂Al₉ / Al-rich intermetallic compound / Charge density wave

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基金资助

国家重点基础研究发展计划(2023YFA140406500)

国家自然科学基金(12574042)

国家自然科学基金(12274388)