Schumacher, Stefan, Huttmann, Felix, Petrovic, Marin ORCID: 0000-0002-2234-1207, Witt, Christian, Foerster, Daniel F., Vo-Van, Chi, Coraux, Johann, Martinez-Galera, Antonio J., Sessi, Violetta, Vergara, Ignacio, Rueckamp, Reinhard, Grueninger, Markus, Schleheck, Nicolas, Heringdorf, Frank Meyer Zu, Ohresser, Philippe ORCID: 0000-0001-8611-1753, Kralj, Marko ORCID: 0000-0002-9786-3130, Wehling, Tim O. and Michely, Thomas (2014). Europium underneath graphene on Ir(111): Intercalation mechanism, magnetism, and band structure. Phys. Rev. B, 90 (23). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

The intercalation of Eu underneath Gr on Ir(111) is comprehensively investigated by microscopic, magnetic, and spectroscopic measurements, as well as by density functional theory. Depending on the coverage, the intercalated Eu atoms form either a (2 x 2) or a (root 3 x root 3) R30 degrees superstructure with respect to Gr. We investigate the mechanisms of Eu penetration through a nominally closed Gr sheet and measure the electronic structures and magnetic properties of the two intercalation systems. Their electronic structures are rather similar. Compared to Gr on Ir(111), the Gr bands in both systems are essentially rigidly shifted to larger binding energies resulting in n doping. The hybridization of the Ir surface state S-1 with Gr states is lifted, and the moire superperiodic potential is strongly reduced. In contrast, the magnetic behavior of the two intercalation systems differs substantially, as found by x-ray magnetic circular dichroism. The (2 x 2) Eu structure displays plain paramagnetic behavior, whereas for the (root 3 x root 3) R30 degrees structure the large zero-field susceptibility indicates ferromagnetic coupling, despite the absence of hysteresis at 10 K. For the latter structure, a considerable easy-plane magnetic anisotropy is observed and interpreted as shape anisotropy.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Schumacher, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huttmann, FelixUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrovic, MarinUNSPECIFIEDorcid.org/0000-0002-2234-1207UNSPECIFIED
Witt, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foerster, Daniel F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vo-Van, ChiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Coraux, JohannUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martinez-Galera, Antonio J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sessi, ViolettaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vergara, IgnacioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rueckamp, ReinhardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grueninger, MarkusUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schleheck, NicolasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heringdorf, Frank Meyer ZuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ohresser, PhilippeUNSPECIFIEDorcid.org/0000-0001-8611-1753UNSPECIFIED
Kralj, MarkoUNSPECIFIEDorcid.org/0000-0002-9786-3130UNSPECIFIED
Wehling, Tim O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-419957
DOI: 10.1103/PhysRevB.90.235437
Journal or Publication Title: Phys. Rev. B
Volume: 90
Number: 23
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1550-235X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
RAY CIRCULAR-DICHROISM; MAGNETOCRYSTALLINE ANISOTROPY; COMPOUND C6EU; DIPOLE TERM; ENERGETICS; KINETICS; SPECTRA; METALSMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/41995

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