Journal Article

PUBDB-2021-01004

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Band structure tuning of Heusler compounds: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling

Chernov, S.Extern* ; Lidig, C.Extern* ; Fedchenko, O.Extern* ; Medjanik, K. ; Babenkov, S.Extern* ; Vasilyev, D.Extern* ; Jourdan, M.Extern* ; Schönhense, G.Extern* ; Elmers, H.-J. (Corresponding author)Extern*

2021
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.103.054407  doi:10.3204/PUBDB-2021-01004

Report No.: arXiv:1910.05205

Abstract: Half-metallic ferromagnetic Heusler compounds represent an important class of materials for spintronic applications. We experimentally observe the dispersion of electronic bands with spin resolution in three representative Heusler compounds (Co$_2$MnGa, Co$_2$MnSi, and Co$_2$Fe$_{0.4}$Mn$_{0.6}$Si). Bulk-sensitive measurements at very low photon energy are complemented by spin-integrated hard x-ray angular resolved photoemission spectroscopy. The dispersion of majority and minority electrons allows us to link exchange splitting and band filling to the number of valence electrons Nv. Photoexcitation at $hν=6.05$ $ eV$ gives access to the spin-polarization texture $P(E_B,k_x,k_y)$ of the bulk bands covering a $(k_x,k_y) $ range of 60% of the Brillouin zone. We find that Co$_2$MnSi and Co$_2$Fe$_{0.4}$Mn$_{0.6}$ exhibit minority band gaps of 0.5 and 0.35 eV, i.e., decreasing band gap with increasing NV in contrast to the rigid-band expectation. For Co$_2$MnGa, the minority valence state maximum lies at approx. 0.2 eV above $E_F$.

Keyword(s): Magnetism

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20180641 (I-20180641) (I-20180641)

Experiment(s):

1. PETRA Beamline P22 (PETRA III)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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