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  Combined spectroscopic and ab initio investigation of monolayer-range Cr oxides on Fe(001): The effect of ordered vacancy superstructure

Calloni, A., Fratesi, G., Achilli, S., Berti, G., Bussetti, G., Picone, A., et al. (2017). Combined spectroscopic and ab initio investigation of monolayer-range Cr oxides on Fe(001): The effect of ordered vacancy superstructure. Physical Review B, 96(8): 085427. doi:10.1103/PhysRevB.96.085427.

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PhysRevB.96.085427.pdf (Verlagsversion), 4MB
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 Urheber:
Calloni, Alberto1, Autor
Fratesi, Guido2, Autor
Achilli, Simona2, Autor
Berti, Giulia1, 3, Autor           
Bussetti, Gianlorenzo1, Autor
Picone, Andrea1, Autor
Brambilla, Alberto1, Autor
Folegati, Paola1, Autor
Ciccacci, Franco1, Autor
Duò, Lamberto1, Autor
Affiliations:
1Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milano, Italy, ou_persistent22              
2ETSF and Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy, ou_persistent22              
3Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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 Zusammenfassung: We investigated the electronic structure of an ultrathin Cr oxide film prepared by growing about 0.8 monolayers of Cr on the oxygen-terminated Fe(001)-p(1×1)O surface and characterized by the formation of an ordered array of Cr vacancies producing a (√5×√5)R27 superstructure. We combined experimental techniques such as angle- and spin-resolved photoemission spectroscopy, low-energy electron diffraction, and scanning tunneling spectroscopy with ab initio calculations, focusing on (i) the peculiar energy dispersion of O2p states and (ii) the orbital and spin character of Cr 3d states. We show that the experimental O2p dispersion can be related to the presence of an ordered vacancy lattice. The comparison with the existing literature on the oxidation of bulk Cr(001), where a network of Cr vacancies with a short-range crystallographic order is present, reveals a similar effect on O states. The valence electronic structure of the Cr oxide layer is mostly composed by spin-minority Cr states, consistent with an antiferromagnetic coupling with the Fe substrate.

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Sprache(n): eng - English
 Datum: 2017-06-092017-02-182017-08-212017-08-15
 Publikationsstatus: Erschienen
 Seiten: 9
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.96.085427
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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: 9 Band / Heft: 96 (8) Artikelnummer: 085427 Start- / Endseite: - Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008