Research output: Contribution to journal › Article › peer-review
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; Usachov, Dmitry Yu; Danzenbächer, Steffen; Hellwig, Johannes; Peters, Marius; Kliemt, Kristin; Kucherenko, Yuri; Antonov, Victor N.; Laubschat, Clemens; Chulkov, Evgueni V.; Ernst, Arthur; Kummer, Kurt; Krellner, Cornelius; Vyalikh, Denis V.
In: ACS Nano, Vol. 16, No. 3, 22.03.2022, p. 3573-3581.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Interlayer Coupling of a Two-Dimensional Kondo Lattice with a Ferromagnetic Surface in the Antiferromagnet CeCo2P2
AU - Poelchen, Georg
AU - Rusinov, Igor P.
AU - Schulz, Susanne
AU - Güttler, Monika
AU - Mende, Max
AU - Generalov, Alexander
AU - Usachov, Dmitry Yu
AU - Danzenbächer, Steffen
AU - Hellwig, Johannes
AU - Peters, Marius
AU - Kliemt, Kristin
AU - Kucherenko, Yuri
AU - Antonov, Victor N.
AU - Laubschat, Clemens
AU - Chulkov, Evgueni V.
AU - Ernst, Arthur
AU - Kummer, Kurt
AU - Krellner, Cornelius
AU - Vyalikh, Denis V.
N1 - Publisher Copyright: © 2022 American Chemical Society. All rights reserved.
PY - 2022/3/22
Y1 - 2022/3/22
N2 - 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.
AB - 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.
KW - angle-resolved photoemission spectroscopy
KW - antiferromagnetic order
KW - CeCoP
KW - heavy fermion
KW - two-dimensional ferromagnetism
KW - two-dimensional Kondo lattice
UR - http://www.scopus.com/inward/record.url?scp=85125332693&partnerID=8YFLogxK
U2 - 10.1021/acsnano.1c10705
DO - 10.1021/acsnano.1c10705
M3 - Article
AN - SCOPUS:85125332693
VL - 16
SP - 3573
EP - 3581
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 3
ER -
ID: 94298319