Local moments in Mn-based Heusler alloys and their electronic structures

Autor(en): Plogmann, S
Schlatholter, T
Braun, J
Neumann, M
Yarmoshenko, YM
Yablonskikh, MV
Shreder, EI
Kurmaev, EZ
Wrona, A
Slebarski, A
Stichwörter: CO2MNSN; CROSS-SECTIONS; FE; HALF-METALLIC FERROMAGNETS; MAGNETIC-MOMENTS; Materials Science; Materials Science, Multidisciplinary; MULTIPLE-SCATTERING THEORY; PHOTOELECTRON-SPECTROSCOPY; PHOTOEMISSION; Physics; Physics, Applied; Physics, Condensed Matter; SPACE-FILLING POTENTIALS; VALENCE-BAND
Erscheinungsdatum: 1999
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 60
Ausgabe: 9
Startseite: 6428
Seitenende: 6438
Zusammenfassung: 
In this article we present a detailed study of the electronic structure from various Mn-based Heusler alloys using x-ray photoelectron spectroscopy (XPS) and x-ray emission spectroscopy (XES) techniques. Performing the measurements on the Mn-2p core levels as well as on the valence-band states we arrive at a more or less complete description of the electronic and magnetic properties of these compounds. The experimental Mn-2p spectra have been compared with fully relativistic photoemission calculations, which are based on the solution of the spin-polarized Dirac equation. The almost constant exchange splitting of about 0.35 eV, measured between the different Mn-2p sublevels is explainable in terms of the local magnetic moment at the Mn site. Moreover a strong relationship between the magnetization direction and the line shapes of the calculated Mn-2p core-level spectra has been revealed from our analysis. Depending on the atomic number of the Z element we obtain from XES experiments an increasing localization of the Mn-3d states. Also the interatomic distances in the different alloys seem to play an important rule in this process. To support this result we performed in addition valence-band measurements by applying XP. These data, which agree very well with the corresponding x-ray emission spectra are quantitatively reproduced from first-principle electronic structure calculations. [S0163-1829(99)09233-4].
ISSN: 10980121
DOI: 10.1103/PhysRevB.60.6428

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