Electronic Structure and Nesting-Driven Enhancement of the RKKY Interaction at the Magnetic Ordering Propagation Vector in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Gd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>PdSi</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Tb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>PdSi</mml:mi><mml:mn>…

D. S. Inosov, D. V. Evtushinsky, A. Koitzsch, V. B. Zabolotnyy, С. В. Борисенко, A. A. Kordyuk, Matthias Frontzek, M. Loewenhaupt, W. Löser, I. Mazilu

Abstract

Measurements of the low-energy electronic structure in ${\mathrm{Gd}}_{2}{\mathrm{PdSi}}_{3}$ and ${\mathrm{Tb}}_{2}{\mathrm{PdSi}}_{3}$ by means of angle-resolved photoelectron spectroscopy reveal a Fermi surface consisting of an electron barrel at the $\ensuremath{\Gamma}$ point surrounded by spindle-shaped electron pockets originating from the same band. The calculated momentum-dependent RKKY coupling strength is peaked at the $\frac{1}{2}\ensuremath{\Gamma}K$ 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.

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