Kondo entanglement in the quasi-two-dimensional heavy fermion compound CeSb2
Kondo entanglement in the quasi-two-dimensional heavy fermion compound CeSb2
复制标题
准二维重费米子化合物 CeSb2 中的近藤纠缠
DOI：
10.1103/physrevb.106.045133
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发表时间：
2022
影响因子：
3.7
通讯作者：
Xinchun Lai
中科院分区：
文献类型：
--
作者：
Yun Zhang;Xuebing Luo;Wei Feng;Shiyong Tan;Qunqing Hao;Qiang Zhang;Dengpeng Yuan;Bo Wang;Yi Liu;Qin Liu;Xiyang Wang;Lizhu Luo;Xiegang Zhu;Qiuyun Chen;Xinchun Lai
在重费米子系统中，近藤相干的发展通常以交叉行为发生。然而，重准粒子完全形成的起始温度的精确定义在一定程度上是有争议的。本文采用高分辨率角分辨光谱学（ARPES）和动态平均场理论方法结合密度泛函理论研究了准二维Kondo晶格${\\ mathm {CeSb}}_{2}$的电子结构。直接观察到由f电子和传导电子杂化产生的重准粒子带。此外，温度相关的电子结构研究揭示了${\\ mathm {CeSb}}_{2}$中从高温局部自旋到低温流动电子的转变，激光- arpes显示的杂化c-f谱重的起始温度与输运和磁测量的交叉温度一致。我们的发现对于在微观上理解重费米子系统的不同能量尺度至关重要，并证明了激光- arpes在研究ce基化合物的体4f电子性质方面的可能性。
In the heavy fermion system, development of the Kondo coherence usually occurs as a crossover behavior. However, accurate definition of the onset temperature for complete formation of the heavy quasiparticles is to some extent controversial. Here, the electronic structure of the quasi-two-dimensional Kondo lattice ${\\mathrm{CeSb}}_{2}$ has been studied by high resolution angle-resolved photoemission spectroscopy (ARPES) and dynamical mean-field theory approach combined with density functional theory. A heavy quasiparticle band, which originates from the hybridization between $f$ electrons and conduction electrons, has been observed directly. Moreover, temperature-dependent electronic structure study reveals a transition from high-temperature local spins to low-temperature itinerant electrons in ${\\mathrm{CeSb}}_{2}$ and the onset temperature of the hybridized c-f spectral weight revealed by laser-ARPES is consistent with the crossover temperature from transport and magnetic measurements. Our findings are essential for a microscopic understanding of different energy scales in the heavy fermion system and demonstrate the probability of laser-ARPES in studying the bulk 4f-electron properties of Ce-based compounds.