Abstract
Measurements of the low-energy electronic structure in and by means of angle-resolved photoelectron spectroscopy reveal a Fermi surface consisting of an electron barrel at the point surrounded by spindle-shaped electron pockets originating from the same band. The calculated momentum-dependent RKKY coupling strength is peaked at the wave vector, which coincides with the propagation vector of the low-temperature in-plane magnetic order observed by neutron diffraction, thereby demonstrating the decisive role of the Fermi surface geometry in explaining the complex magnetic ground state of ternary rare earth silicides.
- Received 21 August 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.046401
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