The electronic structure of the isostructural rare-earth systems TmGa 3, ErGa3, and CeIn3 has recently been investigated by measurements of two-dimensional angular correlations of annihilation radiation (2D ACAR). We employ different tomography techniques to reconstruct electron-positron (e-p) momentum density pi(p) from its line projections. In all these compounds we get very specific shape of pi(p). In order to draw the Fermi surface (FS), we perform conversion from the extended p to reduced k space. In the case of TmGa3 and ErGa3 a nesting feature of the FS consistent with the antiferromagnetic structure is observed. On the other hand, in CeIn3 we cannot detect any link between the FS topology and the vector of the magnetic propagation.
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