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Europium Cyclooctatetraene Nanowire Carpets: A Low-Dimensional, Organometallic, and Ferromagnetic Insulator
Univ Cologne, Inst Phys 2, Zulpicher Str 77, D-50937 Cologne, Germany.
Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47057 Duisburg, Germany;Ctr Nanointegrat Duisburg Essen CENIDE, Lotharstr 1, D-47057 Duisburg, Germany.
Univ Cologne, Inst Phys 2, Zulpicher Str 77, D-50937 Cologne, Germany.
Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47057 Duisburg, Germany;Ctr Nanointegrat Duisburg Essen CENIDE, Lotharstr 1, D-47057 Duisburg, Germany.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 5, p. 911-917Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2019. Vol. 10, no 5, p. 911-917
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-380459DOI: 10.1021/acs.jpclett.8b03711ISI: 000461271700003PubMedID: 30717591OAI: oai:DiVA.org:uu-380459DiVA, id: diva2:1299825
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2013.0020Knut and Alice Wallenberg Foundation, 2012.0031Swedish Foundation for Strategic Research Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-03-28Bibliographically approved

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Thonig, DannyDelin, AnnaFransson, JonasEriksson, Olle

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