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Hourglass-type bulk Ni 3d band and Ce 4f Kondo resonance states in the potential topological Kondo semimetal CeNiSn via angle-resolved photoemission spectroscopy

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4];  [5];  [1]
  1. The Catholic University of Korea, Bucheon (Korea, Republic of)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Korea Atomic Energy Research Institute (KAERI), Daejeon (Korea, Republic of)
  4. Pohang University of Science and Technology (POSTECH) (Korea, Republic of)
  5. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
The electronic structure of CeNiSn, which is a potential topological Kondo insulator and a Dirac nodal-loop semimetal, has been investigated by employing temperature (T) dependent angle-resolved photoemission spectroscopy (ARPES). The Fermi surfaces (FSs) and the band structures of CeNiSn for three orthogonal crystallographic planes are measured, in which both the very dispersive bands and the flat bands are observed, having mainly the Ni 3d character and the Ce 4f character, respectively. The measured FSs and ARPES bands agree reasonably well with the density functional theory (DFT) calculations. The Fermi-edge (EF) photon energy (hν) map along kb (=k(010)) shows that the metallic EF-crossing states on the (010) surface have the three-dimensional character, suggesting that the observed EF-crossing metallic states do not correspond to the topological surface states of the two-dimensional character. On the other hand, albeit weak, the features of the hourglass-type bulk band crossings are observed along SXS, with the energies and the slopes being similar to those predicted by the DFT calculations, supporting the Dirac semimetallic nature of CeNiSn. In T-dependent ARPES, the Ce 4f Kondo resonance states are clearly revealed at low T, which become much suppressed above ~80 K. This feature is consistent with the Kondo temperature of CeNiSn, estimated from its ρ(T) data. This work demonstrates the importance of the coherent Kondo states in determining the topological properties of CeNiSn.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Korea Atomic Energy Research Institute (KAERI); National Research Foundation (NRF) of Korea; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2326188
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 107; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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