Competing charge and magnetic order in the candidate centrosymmetric skyrmion host EuGa_2Al_2
arxiv(2023)
摘要
Eu(Ga_1-xAl_x)_4 are centrosymmetric systems that have recently been
identified as candidates to stabilise topologically non-trivial magnetic
phases, such as skyrmion lattices. In this Letter, we present a high-resolution
resonant x-ray and neutron scattering study on EuAl2Ga2 that provides new
details of the complex coupling between the electronic ordering phenomena. Our
results unambiguously demonstrate that the system orders to form a spin density
wave with moments aligned perpendicular to the direction of the propagation
vector, and upon further cooling, a cycloid with moments in the ab plane, in
contrast to what has been reported in the literature. We show that concomitant
with the onset of the spin density wave is the suppression of the charge order,
indicative of a coupling between the localised 4f electrons and itinerant
electron density. Furthermore we demonstrate that the charge density wave order
breaks the four-fold symmetry present in the I4/mmm crystal structure, thus
declassifying these systems as square-net magnets.
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