Uniaxially Aligned 1D Sandwich-Molecular Wires: Electronic Structure and Magnetism
| Autor: | Stefan Kraus, Alexander Herman, Felix Huttmann, Marco Bianchi, Raluca-Maria Stan, Ann Julie Holt, Shigeru Tsukamoto, Nico Rothenbach, Katharina Ollefs, Jan Dreiser, Ken Bischof, Heiko Wende, Philip Hofmann, Nicolae Atodiresei, Thomas Michely |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Kraus, S, Herman, A, Huttmann, F, Bianchi, M, Stan, R M, Holt, A J, Tsukamoto, S, Rothenbach, N, Ollefs, K, Dreiser, J, Bischof, K, Wende, H, Hofmann, P, Atodiresei, N & Michely, T 2022, ' Uniaxially Aligned 1D Sandwich-Molecular Wires : Electronic Structure and Magnetism ', Journal of Physical Chemistry C, vol. 126, no. 6, pp. 3140-3150 . https://doi.org/10.1021/acs.jpcc.1c10625 The journal of physical chemistry |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.1c10625 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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