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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 4: Magnetic Materials I

MA 4.5: Talk

Monday, March 27, 2006, 11:15–11:30, HSZ 401

Bulk sensitive photoemission spectroscopy of the quaternary Heusler alloy Co2Cr0.6Fe0.4Al. — •Sabine Wurmehl1, Gerhard H. Fecher1, Kristian Kroth1, Florian Kronast2, Hermann A. Dürr2, Yukiharu Takeda3, Yuji Saitoh3, Keisuke Kobayashi3,4, Gerd Schönhense1, and Claudia Felser11Johannes Gutenberg-Universität, 55099 Mainz, Germany — 2BESSY, 12489 Berlin, Germany — 3Spring-8 / JAERI, Hyogo, 679-5198, Japan — 4Spring-8 / JASRI, Hyogo, 679-5198, Japan

Quaternary Heusler alloy Co2Cr0.6Fe0.4Al was investigated experimentally and theoretically. The electronic structure and spectroscopic properties were calculated using the full relativistic Korringa-Kohn-Rostocker method with coherent potential approximation to account for the random distribution of Cr and Fe atoms as well as random disorder.

Resonant (560eV - 800eV) soft X-ray as well as high resolution - high energy (3.5keV, 8keV) hard X-ray photoemission was used to probe the density of the occupied states in Co2Cr0.6Fe0.4Al. It was found by resonant and high energy photoemission that there is a discrepancy between the experimentally observed and the theoretically calculated density of states in Co2Cr0.6Fe0.4Al. This observation suggests the presence of correlation in Heusler compounds being not accounted for by local (spin) density approximation in its current form. Moreover, strong differences in surface and bulk photoemission spectra reveal the loss of the bulk and structure signature if emission takes mainly place from the surface layer. (This work is funded by the DFG in FG 559.)

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