0000000001301934
AUTHOR
C. Felser
Monitoring surface resonances on Co2MnSi(100) by spin-resolved photoelectron spectroscopy
The magnitude of the spin polarization at the Fermi level of ferromagnetic materials at room temperature is a key property for spintronics. Investigating the Heusler compound Co$_2$MnSi a value of 93$\%$ for the spin polarization has been observed at room temperature, where the high spin polarization is related to a stable surface resonance in the majority band extending deep into the bulk. In particular, we identified in our spectroscopical analysis that this surface resonance is embedded in the bulk continuum with a strong coupling to the majority bulk states. The resonance behaves very bulk-like, as it extends over the first six atomic layers of the corresponding (001)-surface. Our study…
A different look at the spin state of Co$^{3+}$ ions in CoO$_{5}$ pyramidal coordination
Using soft-x-ray absorption spectroscopy at the Co-$L_{2,3}$ and O-$K$ edges, we demonstrate that the Co$^{3+}$ ions with the CoO$_{5}$ pyramidal coordination in the layered Sr$_2$CoO$_3$Cl compound are unambiguously in the high spin state. Our result questions the reliability of the spin state assignments made so far for the recently synthesized layered cobalt perovskites, and calls for a re-examination of the modeling for the complex and fascinating properties of these new materials.
CCDC 682994: Experimental Crystal Structure Determination
Related Article: A.Getsis, B.Balke, C.Felser, A.-V.Mudring|2009|Cryst.Growth Des.|9|4429|doi:10.1021/cg900463b
CSD 1781403: Experimental Crystal Structure Determination
Related Article: S. Zimmermann, M. Bruehmann, F. Casper, O. Heyer, T. Lorenz, C. Felser, A.V. Mudring, G. Meyer|2010|Eur.J.Inorg.Chem.||2613|doi:10.1002/ejic.201000223