kagome金属FeGe中一种新电荷序的光发射证据

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Zhisheng Zhao, Tongrui Li, Peng Li, Xueliang Wu, Jianghao Yao, Ziyuan Chen, Yajun Yan, Shengtao Cui, Zhe Sun, Yichen Yang, Zhicheng Jiang, Zhengtai Liu, Alex Louat, Timur Kim, Cephise Cacho, Aifeng Wang, Yilin Wang, Dawei Shen, Juan Jiang, Donglai Feng
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引用次数: 0

摘要

kagome金属FeGe为理解竞争序背后的机制提供了丰富的平台,因为它在反铁磁相深处显示出电荷序(CO)。为了研究这种行为的内在起源,我们使用角分辨光电发射光谱研究了退火FeGe样品中低能电子结构在相变中的演变。我们没有发现支持传统嵌套机制的证据,如费米表面嵌套或范霍夫奇点。然而,我们观察到两个显著的能带结构变化:在K点周围有一个电子带,在A点周围有另一个电子带,当CO形成时,两者的能量都向上移动。这些发现与我们的密度泛函理论计算一致,这表明FeGe中的电荷顺序主要是由涉及ge1二聚化的晶格畸变引起的磁能节约所驱动的。与传统的巢状驱动机制相比,我们的研究结果提供了光发射证据,支持这种新的机制在FeGe中形成CO。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Photoemission evidence of a novel charge order in kagome metal FeGe

The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order (CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angle-resolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the K point and another around the A point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe, in contrast to the conventional nesting-driven mechanisms.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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