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Title: Large Fermi surface expansion through anisotropic mixing of conduction and $f$ electrons in the semimetallic Kondo lattice CeBi

Abstract

Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-$f$ electron mixing ($c-f$ mixing) in CeBi by observing a largely expanded Ce 5$d$ pocket at low temperature, with no change in the Bi-6p bands. We note the Fermi surface (FS) expansion is accompanied by a pronounced spectral weight transfer from the local 4$f^0$ peak of Ce (corresponding to Ce3+) to the itinerant conduction bands near the Fermi level. Careful analysis suggests that the observed large FS change (with a volume expansion of the electron pocket up to 40%) can most naturally be explained by a small valence change (~1%) of Ce, which coexists with a very weak Kondo screening. Our work therefore provides evidence for a FS change driven by real charge fluctuations deep in the Kondo limit, which are made possible by the low carrier density. Our results highlight the large tunability of the FS in low carrier density Kondo systems.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [2];  [3];  [4];  [4];  [5];  [6];  [1]; ORCiD logo [6]
  1. Zhejiang Univ., Hangzhou (People’s Republic of China)
  2. Univ. of Science and Technology of China, Hefei (People’s Republic of China)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Hangzhou Normal Univ. (People’s Republic of China)
  6. Zhejiang Univ., Hangzhou (People’s Republic of China); Nanjing Univ. (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
Ministry of Science and Technology of the People’s Republic of China (MOST); National Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1599070
Grant/Contract Number:  
AC02-06CH11357; 2017YFA0303100; 2016YFA0300203; 11674280; 11274006; 2019QNA3007; DMR-0703406
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 100; Journal Issue: 15
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Peng, Wu, Zhongzheng, Wu, Fan, Guo, Chunyu, Liu, Yi, Liu, Haijiang, Sun, Zhe, Shi, Ming, Rodolakis, Fanny, McChesney, Jessica L., Cao, Chao, Yuan, Huiqiu, Steglich, Frank, and Liu, Yang. Large Fermi surface expansion through anisotropic mixing of conduction and $f$ electrons in the semimetallic Kondo lattice CeBi. United States: N. p., 2019. Web. https://doi.org/10.1103/PhysRevB.100.155110.
Li, Peng, Wu, Zhongzheng, Wu, Fan, Guo, Chunyu, Liu, Yi, Liu, Haijiang, Sun, Zhe, Shi, Ming, Rodolakis, Fanny, McChesney, Jessica L., Cao, Chao, Yuan, Huiqiu, Steglich, Frank, & Liu, Yang. Large Fermi surface expansion through anisotropic mixing of conduction and $f$ electrons in the semimetallic Kondo lattice CeBi. United States. https://doi.org/10.1103/PhysRevB.100.155110
Li, Peng, Wu, Zhongzheng, Wu, Fan, Guo, Chunyu, Liu, Yi, Liu, Haijiang, Sun, Zhe, Shi, Ming, Rodolakis, Fanny, McChesney, Jessica L., Cao, Chao, Yuan, Huiqiu, Steglich, Frank, and Liu, Yang. Mon . "Large Fermi surface expansion through anisotropic mixing of conduction and $f$ electrons in the semimetallic Kondo lattice CeBi". United States. https://doi.org/10.1103/PhysRevB.100.155110. https://www.osti.gov/servlets/purl/1599070.
@article{osti_1599070,
title = {Large Fermi surface expansion through anisotropic mixing of conduction and $f$ electrons in the semimetallic Kondo lattice CeBi},
author = {Li, Peng and Wu, Zhongzheng and Wu, Fan and Guo, Chunyu and Liu, Yi and Liu, Haijiang and Sun, Zhe and Shi, Ming and Rodolakis, Fanny and McChesney, Jessica L. and Cao, Chao and Yuan, Huiqiu and Steglich, Frank and Liu, Yang},
abstractNote = {Using angle-resolved photoemission spectroscopy (ARPES) and resonant ARPES, we report evidence of strong anisotropic conduction-$f$ electron mixing ($c-f$ mixing) in CeBi by observing a largely expanded Ce 5$d$ pocket at low temperature, with no change in the Bi-6p bands. We note the Fermi surface (FS) expansion is accompanied by a pronounced spectral weight transfer from the local 4$f^0$ peak of Ce (corresponding to Ce3+) to the itinerant conduction bands near the Fermi level. Careful analysis suggests that the observed large FS change (with a volume expansion of the electron pocket up to 40%) can most naturally be explained by a small valence change (~1%) of Ce, which coexists with a very weak Kondo screening. Our work therefore provides evidence for a FS change driven by real charge fluctuations deep in the Kondo limit, which are made possible by the low carrier density. Our results highlight the large tunability of the FS in low carrier density Kondo systems.},
doi = {10.1103/PhysRevB.100.155110},
journal = {Physical Review, B: Condensed Matter},
number = 15,
volume = 100,
place = {United States},
year = {2019},
month = {10}
}

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