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Phys Rev Lett. 2007 Jul 27;99(4):047204. Epub 2007 Jul 25.

YCo2: intrinsic magnetic surface of a paramagnetic bulk material.

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  • 1Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany.


Here we report on results of a spin-resolved photoelectron spectroscopic (SRPES) study of YCo2 thin films (150 A-thick) grown on a W(110) substrate. The films were prepared by co-deposition of stoichiometric amounts of Y and Co onto a clean W surface followed by thermal annealing leading to (2x2) overstructure with respect to W(110) in the low-energy electron diffraction pattern indicated formation of a structurally ordered YCo2(111) surface. While no clear spin asymmetry was observed for bulk-sensitive SRPES data taken at hnu=1253.6 eV, the more surface-sensitive SRPES data obtained at hnu=21.2 eV photon energy revealed a clear spin-asymmetry probing the validity of the recent theoretical prediction.

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