%0 Journal Article
%A Soh, Jian Rui
%A Merkel, Maximilian E.
%A Pourovskii, Leonid V.
%A Zivkovic, Ivica
%A Malanyuk, Oleg
%A Pasztorova, Jana
%A Francoual, Sonia
%A Hirai, Daigorou
%A Urru, Andrea
%A Tolj, Davor
%A Fiore Mosca, Dario
%A Yazyev, Oleg V.
%A Spaldin, Nicola
%A Ederer, Claude
%A Rønnow, Henrik M.
%T Spectroscopic signatures and origin of hidden order in Ba<sub>2</sub>MgReO<sub>6</sub>
%J Nature Communications
%V 15
%N 1
%@ 2041-1723
%C [London]
%I Nature Publishing Group UK
%M PUBDB-2024-07497
%P 10383
%D 2024
%X Clarifying the underlying mechanisms that govern ordering transitions in condensed matter systems is crucial for comprehending emergent properties and phenomena. While transitions are often classified as electronically driven or lattice-driven, we present a departure from this conventional picture in the case of the double perovskite Ba<sub>2</sub>MgReO<sub>6</sub>. Leveraging resonant and non-resonant elastic x-ray scattering techniques, we unveil the simultaneous ordering of structural distortions and charge quadrupoles at a critical temperature of T<sub>q</sub>   33 K. Using a variety of complementary first-principles-based computational techniques, we demonstrate that, while electronic interactions drive the ordering at T<sub>q</sub>, it is ultimately the lattice distortions that dictate the specific ground state that emerges. Our findings highlight the crucial interplay between electronic and lattice degrees of freedom, providing a unified framework to understand and predict unconventional emergent phenomena in quantum materials. 
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 39613737
%U <Go to ISI:>//WOS:001367893700015
%R 10.1038/s41467-024-53893-z
%U https://bib-pubdb1.desy.de/record/619239