Itinerant to relocalized transition of f electrons in the Kondo insulator CeRu4Sn6

doi:10.1007/s11467-023-1298-y

Front. Phys.

2023, Vol. 18

Issue (5) : 53304 https://doi.org/10.1007/s11467-023-1298-y

RESEARCH ARTICLE

Itinerant to relocalized transition of f electrons in the Kondo insulator CeRu₄Sn₆

Fan-Ying Wu¹, Qi-Yi Wu¹, Chen Zhang¹, Yang Luo¹, Xiangqi Liu², Yuan-Feng Xu³, Dong-Hui Lu⁴, Makoto Hashimoto⁴, Hao Liu¹, Yin-Zou Zhao¹, Jiao-Jiao Song¹, Ya-Hua Yuan¹, Hai-Yun Liu⁵, Jun He¹, Yu-Xia Duan¹, Yan-Feng Guo^2,⁶(

), Jian-Qiao Meng¹(

)

¹. School of Physics and Electronics, Central South University, Changsha 410083, China
². School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
³. Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, China
⁴. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
⁵. Beijing Academy of Quantum Information Sciences, Beijing 100085, China
⁶. ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China

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Abstract

The three-dimensional electronic structure and the nature of Ce 4f electrons of the Kondo insulator CeRu₄Sn₆ are investigated by angle-resolved photoemission spectroscopy, utilizing tunable photon energies. Our results reveal (i) the three-dimensional k-space nature of the Fermi surface, (ii) the localized-to-itinerant transition of f electrons occurs at a much high temperature than the hybridization gap opening temperature, and (iii) the “relocalization” of itinerant f-electrons below 25 K, which could be the precursor to the establishment of magnetic order.

Keywords Kondo insulator heavy fermion ARPES electronic structure relocalization

Corresponding Author(s): Yan-Feng Guo,Jian-Qiao Meng

Issue Date: 22 May 2023

Cite this article:

Fan-Ying Wu,Qi-Yi Wu,Chen Zhang, et al. Itinerant to relocalized transition of f electrons in the Kondo insulator CeRu₄Sn₆[J]. Front. Phys. , 2023, 18(5): 53304.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-023-1298-y
https://academic.hep.com.cn/fop/EN/Y2023/V18/I5/53304

Fig.1 Fermi surface mappings of CeRu

4

6

at 20 K. (a) The bulk BZ and the projected surface BZ for both (100) and (001) surfaces with high-symmetry momentum points marked. (b) Calculated FS of CeRu

4

6

with LDA + Gutzwiller method. The 3D FS is presented in the body-centered tetragonal Brillouin zone, in which one unit cell contains one Ce atom. Here different color stands for different FS sheets. (c1) and (d1) Calculated FS contours at the

Γ − X − P − Z

plane and

k x

−

k z

plane (

Γ

point), respectively. The solid lines represent the FS contours at

E F

, and the dashed lines represent the FS contours at

E B

= 0.01 eV. (c2) Experimental 3D FS map of the

E F

intensity constructed out of 51

E F

cuts along

k z

through the zone center measured (110) surface with

h

ν

= 40−90 eV photons in 1 eV steps, in the

Γ − X − P − Z

plane. The inner potential,

V 0

, was estimated as 14 eV. (d2) FS mapping at the

k x

−

k z

plane [(010) surface] taken with 80 (left panel) and 85 eV photons (right panel). All photoemission intensity data were integrated over a [−10 meV, 10 meV] energy window with respect to the

E F

Fig.2 On- and off-resonance ARPES data of CeRu

4

6

taken at 14 K with (a) off-resonance (114 eV)

s

-polarized, (b) on-resonance (121 eV)

s

-polarized, and (c) on-resonance

p

-polarized light. Inset: Second-derivative image with respect to energy. (d) Angle-integrated photoemission spectroscopy of the intensity plot in (a), (b), and (c).

Fig.3 On-resonance ARPES data of CeRu

4

6

taken with right- (a) and left-polarized (b) light. (c) The normalized difference [(CR − CL)/(CR + CL)].

Fig.4 Temperature evolution of the heavy quasiparticle bands. (a) On-resonance (122 eV) band structure of CeRu

4

6

at labeled temperatures. (b) Detailed ARPES spectral of CeRu

4

6

measured at 7, 100, and 230 K. Arrow indicates angle increase. (c) The angle-integrated EDCs over the angle range shown in (a) at various temperatures. (d) Temperature dependence of the heavy quasiparticle spectral weight. The cyan and magenta lines represent spectral weight integrals of the light cyan and light pink regions shown in (c), respectively. The blue squares represent the spectral weight integrals over [0.5 eV, 0.7 eV].

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