Electronic structure study of LaCoIn5 and its comparison with CeCoIn5

Q. Y. Chen, X. B. Luo, E. Vescovo, K. Kaznatcheev, F. J. Walker, C. H. Ahn, Z. F. Ding, Z. H. Zhu, L. Shu, Y. B. Huang, and J. Jiang
Phys. Rev. B 100, 035117 – Published 17 July 2019

Abstract

A central key to understanding heavy-fermion systems involves revealing how itinerant low-energy excitations emerge from local f moments. An effective way to understand the f-electron behavior is to compare the electronic structure of f-electron compounds with a reference isostructural compound with no f electrons. Here we present a systematic electronic structure study of LaCoIn5, which is a non-f reference compound of the heavy-fermion superconductor CeCoIn5. Our angle-resolved photoemission spectroscopy study of the three-dimensional Fermi surface and band structure of LaCoIn5 highlights the rather three-dimensional electronic character of this compound. The conduction bands of LaCoIn5 are almost identical to that of CeCoIn5, though obvious differences can be found in the low-energy electronic structure. Finally, we give a quantitative analysis of the Fermi pocket change in LaCoIn5 and CeCoIn5, which may be helpful for understanding the important “large” and “small” Fermi surface issue in heavy-fermion compounds.

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  • Received 10 May 2019
  • Revised 2 July 2019

DOI:https://doi.org/10.1103/PhysRevB.100.035117

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Q. Y. Chen1,*, X. B. Luo1, E. Vescovo2, K. Kaznatcheev2, F. J. Walker3, C. H. Ahn3, Z. F. Ding4, Z. H. Zhu4, L. Shu4, Y. B. Huang5, and J. Jiang3,†

  • 1Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621908, China
  • 2National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA
  • 4State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 5Shanghai Institute of Applied Physics, CAS, Shanghai 201204, China

  • *sheqiuyun@126.com
  • juan.jiang@yale.edu

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Issue

Vol. 100, Iss. 3 — 15 July 2019

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