Huttmann, Felix, Rothenbach, Nico, Kraus, Stefan, Ollefs, Katharina, Arruda, Lucas M., Bernien, Matthias, Thonig, Danny ORCID: 0000-0001-8007-5392, Delin, Anna, Fransson, Jonas, Kummer, Kurt ORCID: 0000-0003-3044-7957, Brookes, Nicholas B., Eriksson, Olle, Kuch, Wolfgang, Michely, Thomas and Wende, Heiko ORCID: 0000-0001-8395-3541 (2019). Europium Cyclooctatetraene Nanowire Carpets: A Low-Dimensional, Organometallic, and Ferromagnetic Insulator. J. Phys. Chem. Lett., 10 (5). S. 911 - 924. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

We investigate the magnetic and electronic properties of europium cyclooctatetraene (EuCot) nanowires by means of low-temperature X-ray magnetic circular dichroism (XMCD) and scanning tunneling microscopy (STM) and spectroscopy (STS). The EuCot nanowires are prepared in situ on a graphene surface. STS measurements identify EuCot as an insulator with a minority band gap of 2.3 eV. By means of Eu M-5,M-4 edge XMCD, orbital and spin magnetic moments of (-0.1 +/- 0.3)mu(B) and (+7.0 +/- 0.6)mu(B), respectively, were determined. Field-dependent measurements of the XMCD signal at the Eu M-5 edge show hysteresis for grazing X-ray incidence at 5 K, thus confirming EuCot as a ferromagnetic material. Our density functional theory calculations reproduce the experimentally observed minority band gap. Modeling the experimental results theoretically, we find that the effective interatomic exchange interaction between Eu atoms is on the order of millielectronvolts, that magnetocrystalline anisotropy energy is roughly half as big, and that dipolar energy is approximately ten times lower.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Huttmann, FelixUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rothenbach, NicoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kraus, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ollefs, KatharinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arruda, Lucas M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bernien, MatthiasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thonig, DannyUNSPECIFIEDorcid.org/0000-0001-8007-5392UNSPECIFIED
Delin, AnnaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fransson, JonasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kummer, KurtUNSPECIFIEDorcid.org/0000-0003-3044-7957UNSPECIFIED
Brookes, Nicholas B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eriksson, OlleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuch, WolfgangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wende, HeikoUNSPECIFIEDorcid.org/0000-0001-8395-3541UNSPECIFIED
URN: urn:nbn:de:hbz:38-154117
DOI: 10.1021/acs.jpclett.8b03711
Journal or Publication Title: J. Phys. Chem. Lett.
Volume: 10
Number: 5
Page Range: S. 911 - 924
Date: 2019
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1948-7185
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
RAY CIRCULAR-DICHROISM; MAGNETIC-ANISOTROPY; SANDWICH COMPLEXES; CLUSTERSMultiple languages
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & ChemicalMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15411

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