Journal Article

FZJ-2022-01290

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Uniaxially Aligned 1D Sandwich-Molecular Wires: Electronic Structure and Magnetism

Kraus, S. (Corresponding author) ; Herman, A. ; Huttmann, F. ; Bianchi, M. ; Stan, R.-M. ; Holt, A. J. ; Tsukamoto, S.FZJ* ; Rothenbach, N. ; Ollefs, K. ; Dreiser, J. ; Bischof, K. ; Wende, H. ; Hofmann, P. ; Atodiresei, N.FZJ* ; Michely, T.

2022
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/32208  doi:10.1021/acs.jpcc.1c10625

Abstract: Sandwich-molecular wires consisting of europium and cyclooctatetraene (Cot) were grown in situ on the moiré of graphene with Ir(110). The moiré templates a uniaxial alignment of monolayer EuCot nanowire carpets and multilayer films with the EuCot wire axis along the [001] direction of the Ir substrate. Using angle-resolved photoemission spectroscopy, we investigate the band structure of the wire carpet films. While π-derived bands were not observed experimentally, we find a flat band 1.85 eV below the Fermi energy. Using density-functional theory and X-ray photoelectron spectroscopy and replacing europium through barium in the sandwich-molecular wires, it is concluded that the flat band is derived from Eu 4f states weakly mixed with Eu 5d states and slightly overlapping with Cot π states. X-ray magnetic circular dichroism is employed to characterize the magnetic properties of the EuCot wire carpet films at low temperatures. Clear evidence for an easy-axis magnetization along the wires is found.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)
4. JARA - HPC (JARA-HPC)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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