Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe
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狄拉克半金属 CeSbTe 中的电荷密度波和弱近藤效应

DOI:
10.1007/s11433-020-1642-2
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发表时间:
2020-11
期刊:
Science China Physics Mechanics & Astronomy
影响因子:
--
通讯作者:
Yang Liu
Yang Liu
中科院分区:
其他
文献类型:
--
作者:
Peng Li;Baijing Lv;Yuan Fang;Wei Guo;Zhongzheng Wu;Yi Wu;Cheng-Maw Cheng;Dawei Shen;Yuefeng Nie;Luca Petaccia;Chao Cao;Zhu-An Xu;Yang Liu

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利用角分辨光电子能谱(ARPES)和低能电子衍射(LEED),结合密度泛函理论(DFT)计算,研究了CeSbTe中电荷密度波(CDW)的形成及其与近藤效应和拓扑态的相互作用.观察到的费米面(FS)表现出平行的片段,可以很好地连接所观察到的CDW有序矢量,表明CDW顺序是由电子-声子耦合(EPC)作为嵌套FS的结果驱动。CDW能隙很大(约0.3 eV),并且与动量有关,这自然解释了在高温下CDW的稳定性。差距的打开导致费米能级(EF)附近的态密度(DOS)降低,这相应地抑制了多体近藤效应,导致在20 K及更高温度下非常局域化的4f电子。拓扑狄拉克锥在theX点被发现保持无缝内CDW相。我们的结果为近藤晶格系统中CDW与近藤效应的竞争提供了证据。CeSbTe和相关化合物中的强CDW有序为寻找长期寻求的轴向绝缘体提供了机会。
Using angle-resolved photoemission spectroscopy (ARPES) and low-energy electron diffraction (LEED), together with density-functional theory (DFT) calculation, we report the formation of charge density wave (CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface (FS) exhibits parallel segments that can be well connected by the observed CDW ordering vector, indicating that the CDW order is driven by the electron-phonon coupling (EPC) as a result of the nested FS. The CDW gap is large (∼0.3 eV) and momentum-dependent, which naturally explains the robust CDW order up to high temperatures. The gap opening leads to a reduced density of states (DOS) near the Fermi level (EF), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4f electrons at 20 K and above. The topological Dirac cone at theXpoint is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDW and the Kondo effect in a Kondo lattice system. The robust CDW order in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.
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