Electronic structure and nesting-driven enhancement of the RKKY interaction at the magnetic ordering propagation vector in Gd2PdSi3 and Tb2PdSi3.
Measurements of the low-energy electronic structure in Gd2PdSi3 and Tb2PdSi3 by means of angle-resolved photoelectron spectroscopy reveal a Fermi surface consisting of an electron barrel at the Gamma point surrounded by spindle-shaped electron pockets originating from the same band. The calculated momentum-dependent RKKY coupling strength is peaked at the 1/2GammaK 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.
Inosov
D S
DS
Leibniz Institut für Festkörper- und Werkstoffforschung Dresden, D-01171 Dresden, Germany.
Evtushinsky
D V
DV
Koitzsch
A
A
Zabolotnyy
V B
VB
Borisenko
S V
SV
Kordyuk
A A
AA
Frontzek
M
M
Loewenhaupt
M
M
Löser
W
W
Mazilu
I
I
Bitterlich
H
H
Behr
G
G
Hoffmann
J-U
JU
Follath
R
R
Büchner
B
B