Signature of spin-phonon coupling driven charge density wave in a kagome magnet.
Signature of spin-phonon coupling driven charge density wave in a kagome magnet.
复制标题
DOI：
10.1038/s41467-023-41957-5
复制
发表时间：
2023-10-04
影响因子：
16.6
通讯作者：
Lee, H. N.
中科院分区：
文献类型：
--
作者：
Miao, H.;Zhang, T. T.;Li, H. X.;Fabbris, G.;Said, A. H.;Tartaglia, R.;Yilmaz, T.;Vescovo, E.;Yin, J. -X.;Murakami, S.;Feng, X. L.;Jiang, K.;Wu, X. L.;Wang, A. F.;Okamoto, S.;Wang, Y. L.;Lee, H. N.
自旋、电荷和晶格自由度之间的相互交织可能会产生异常的宏观量子态，包括高温超导和量子反常霍尔效应。最近，在Kagome反铁磁体FeGe中观察到一个电荷密度波(CDW)，这表明可能存在缠绕物理。一个悬而未决的问题是，磁关联是否是自发空间对称破缺有序的基础。在这里，利用弹性和高分辨率的非弹性x射线散射，我们观察到在Kagome平面上与221个CDW矢量共存的c轴超晶格矢量。最有趣的是，在磁转变温度和CDW转变温度之间，声子动力学结构因子在c轴波矢附近显示出巨大的声子能量硬化和显著的声子线宽加宽，这两者都标志着自旋-声子耦合。通过第一性原理和模型计算，我们发现静态自旋极化和动态自旋激发都与声子缠绕在一起，驱动FeGe的空间对称性破缺。Kagome磁体FeGe中的磁性和电荷密度波之间的相互作用正在争论中。通过使用弹性和非弹性X射线散射、角度分辨光电子能谱和第一性原理计算，Miao等人。提出通过自旋-声子耦合来稳定电荷密度波。
The intertwining between spin, charge, and lattice degrees of freedom can give rise to unusual macroscopic quantum states, including high-temperature superconductivity and quantum anomalous Hall effects. Recently, a charge density wave (CDW) has been observed in the kagome antiferromagnet FeGe, indicative of possible intertwining physics. An outstanding question is that whether magnetic correlation is fundamental for the spontaneous spatial symmetry breaking orders. Here, utilizing elastic and high-resolution inelastic x-ray scattering, we observe a c-axis superlattice vector that coexists with the 221 CDW vectors in the kagome plane. Most interestingly, between the magnetic and CDW transition temperatures, the phonon dynamical structure factor shows a giant phonon-energy hardening and a substantial phonon linewidth broadening near the c-axis wavevectors, both signaling the spin-phonon coupling. By first principles and model calculations, we show that both the static spin polarization and dynamic spin excitations intertwine with the phonon to drive the spatial symmetry breaking in FeGe. The interplay between magnetism and charge density wave in the kagome magnet FeGe is under debate. By using elastic and inelastic X-ray scattering, angle-resolved photoemission spectroscopy, and first principles calculations, Miao et al. propose that the charge density wave is stabilized by spin-phonon coupling.
登录
查看更多内容
DOI：
10.1073/pnas.1708549114
发表时间：
2017-11-21
影响因子：
11.1
作者：
Miao, H.;Lorenzana, J.;Dean, M. P. M.
通讯作者：
Dean, M. P. M.
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
8.6
作者：
Haule, Kristjan
通讯作者：
Haule, Kristjan
影响因子：
3.7
作者：
Gonze, X;Lee, C
通讯作者：
Lee, C
Kagome 金属 AV3Sb5 中电荷密度波的几何形状
影响因子：
3.7
作者：
Miao, H.;Li, H. X.;Yan, Binghai
通讯作者：
Yan, Binghai