Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 126, Issue 6, Pages 3140-3150Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c10625
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Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [MI 581/23-1, AT 109/5-1, WE 2623/17-1, 389895192]
- DFG [CRC1238, 277146874 - CRC 1238]
- VILLUM FONDEN via the Centre of Excellence for Dirac Materials [11744]
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Sandwich-molecular wires consisting of europium and cyclooctatetraene were grown on a graphene template and their band structure and magnetic properties were investigated. The wires exhibit a unique band structure and an easy-axis magnetization along the wire direction.
Sandwich-molecular wires consisting of europium and cyclooctatetraene (Cot) were grown in situ on the moire ' of graphene with Ir(110). The moire 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 p-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 pi 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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