Antiferromagnetic Phase Transition in Ordered FePt3 Investigated by Angle-Resolved Photoemission Spectroscopy

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The electronic band structure of ordered FePt3(110) single crystal was studied by angle-resolved photoemission spectroscopy with synchrotron radiation. The energy band dispersions along the $X$–$\Gamma$–$X$ and $R$–$M$–$R$ directions of a simple cubic Brillouin zone were successfully observed at room temperature. Along the latter direction, band folding due to antiferromagnetic (AF) ordering was clearly observed below the Néel temperature ($T_{\text{N2}}$) of 100 K. Through comparison with theoretical calculations, $(1/2, 0, 0)$-type AF ordering or a mixture of the $(1/2, 0, 0)$-type and $(1/2, 1/2, 0)$-type AF orderings was concluded to occur below $T_{\text{N2}}$. These magnetic orderings can be understood from the viewpoint of the nesting between the electron and hole pockets.
2010-02-15