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Interlayer Coupling of a Two-Dimensional Kondo Lattice with a Ferromagnetic Surface in the Antiferromagnet CeCo2P2

Poelchen, Georg ; Rusinov, Igor P. ; Schulz, Susanne ; Güttler, Monika ; Mende, Max ; Generalov, Alexander LU ; Usachov, Dmitry Yu ; Danzenbächer, Steffen ; Hellwig, Johannes and Peters, Marius , et al. (2022) In ACS Nano 16(3). p.3573-3581
Abstract

The f-driven temperature scales at the surfaces of strongly correlated materials have increasingly come into the focus of research efforts. Here, we unveil the emergence of a two-dimensional Ce Kondo lattice, which couples ferromagnetically to the ordered Co lattice below the P-terminated surface of the antiferromagnet CeCo2P2. In its bulk, Ce is passive and behaves tetravalently. However, because of symmetry breaking and an effective magnetic field caused by an uncompensated ferromagnetic Co layer, the Ce 4f states become partially occupied and spin-polarized near the surface. The momentum-resolved photoemission measurements indicate a strong admixture of the Ce 4f states to the itinerant bands near the Fermi... (More)

The f-driven temperature scales at the surfaces of strongly correlated materials have increasingly come into the focus of research efforts. Here, we unveil the emergence of a two-dimensional Ce Kondo lattice, which couples ferromagnetically to the ordered Co lattice below the P-terminated surface of the antiferromagnet CeCo2P2. In its bulk, Ce is passive and behaves tetravalently. However, because of symmetry breaking and an effective magnetic field caused by an uncompensated ferromagnetic Co layer, the Ce 4f states become partially occupied and spin-polarized near the surface. The momentum-resolved photoemission measurements indicate a strong admixture of the Ce 4f states to the itinerant bands near the Fermi level including surface states that are split by exchange interaction with Co. The temperature-dependent measurements reveal strong changes of the 4f intensity at the Fermi level in accordance with the Kondo scenario. Our findings show how rich and diverse the f-driven properties can be at the surface of materials without f-physics in the bulk.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
angle-resolved photoemission spectroscopy, antiferromagnetic order, CeCoP, heavy fermion, two-dimensional ferromagnetism, two-dimensional Kondo lattice
in
ACS Nano
volume
16
issue
3
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85125332693
  • pmid:35156797
ISSN
1936-0851
DOI
10.1021/acsnano.1c10705
language
English
LU publication?
yes
id
25626ca6-7c93-41ea-bb3c-c2302612aff0
date added to LUP
2022-05-23 15:21:19
date last changed
2024-06-13 12:50:32
@article{25626ca6-7c93-41ea-bb3c-c2302612aff0,
  abstract     = {{<p>The f-driven temperature scales at the surfaces of strongly correlated materials have increasingly come into the focus of research efforts. Here, we unveil the emergence of a two-dimensional Ce Kondo lattice, which couples ferromagnetically to the ordered Co lattice below the P-terminated surface of the antiferromagnet CeCo<sub>2</sub>P<sub>2</sub>. In its bulk, Ce is passive and behaves tetravalently. However, because of symmetry breaking and an effective magnetic field caused by an uncompensated ferromagnetic Co layer, the Ce 4f states become partially occupied and spin-polarized near the surface. The momentum-resolved photoemission measurements indicate a strong admixture of the Ce 4f states to the itinerant bands near the Fermi level including surface states that are split by exchange interaction with Co. The temperature-dependent measurements reveal strong changes of the 4f intensity at the Fermi level in accordance with the Kondo scenario. Our findings show how rich and diverse the f-driven properties can be at the surface of materials without f-physics in the bulk.</p>}},
  author       = {{Poelchen, Georg and Rusinov, Igor P. and Schulz, Susanne and Güttler, Monika and Mende, Max and Generalov, Alexander and Usachov, Dmitry Yu and Danzenbächer, Steffen and Hellwig, Johannes and Peters, Marius and Kliemt, Kristin and Kucherenko, Yuri and Antonov, Victor N. and Laubschat, Clemens and Chulkov, Evgueni V. and Ernst, Arthur and Kummer, Kurt and Krellner, Cornelius and Vyalikh, Denis V.}},
  issn         = {{1936-0851}},
  keywords     = {{angle-resolved photoemission spectroscopy; antiferromagnetic order; CeCoP; heavy fermion; two-dimensional ferromagnetism; two-dimensional Kondo lattice}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  pages        = {{3573--3581}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Nano}},
  title        = {{Interlayer Coupling of a Two-Dimensional Kondo Lattice with a Ferromagnetic Surface in the Antiferromagnet CeCo<sub>2</sub>P<sub>2</sub>}},
  url          = {{http://dx.doi.org/10.1021/acsnano.1c10705}},
  doi          = {{10.1021/acsnano.1c10705}},
  volume       = {{16}},
  year         = {{2022}},
}