Magnetic ground state and Fermi surface of bcc Eu

Institut for Fysik og Astronomi Aarhus Universitet, Ny Munkegade, 8000 Aarhus C, Denmark(Dated: February 2, 2008)Using spin-spiral technique within the full potential linearized augmented-plane-waves (LAPW)electronic structure method we investigate the magnon spectrum and N´eel temperature of bccEu. Ground state corresponding to an incommensurate spin-spiral is obtained in agreement withexperiment and previous calculations. We demonstrate that the magnetic coupling is primarilythrough the intra-atomic f−s and f−d exchange and Ruderman-Kittel-Kasuya-Yosida mechanism.We show that the existence of this spin-spiral is closely connected to a nesting feature of the Fermisurface which was not noticed before.

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