Spectroscopic signatures and origin of hidden order in Ba2MgReO6

Jian-Rui Soh (), Maximilian E. Merkel, Leonid V. Pourovskii, Ivica Živković, Oleg Malanyuk, Jana Pásztorová, Sonia Francoual, Daigorou Hirai, Andrea Urru, Davor Tolj, Dario Fiore Mosca, Oleg V. Yazyev, Nicola A. Spaldin, Claude Ederer and Henrik M. Rønnow
Additional contact information
Jian-Rui Soh: Agency for Science Technology and Research (A*STAR)
Maximilian E. Merkel: ETH Zürich
Leonid V. Pourovskii: Institut Polytechnique de Paris
Ivica Živković: École Polytechnique Fédérale de Lausanne (EPFL)
Oleg Malanyuk: École Polytechnique Fédérale de Lausanne (EPFL)
Jana Pásztorová: École Polytechnique Fédérale de Lausanne (EPFL)
Sonia Francoual: Deutsches Elektronen-Synchrotron DESY
Daigorou Hirai: Nagoya University
Andrea Urru: ETH Zürich
Davor Tolj: École Polytechnique Fédérale de Lausanne (EPFL)
Dario Fiore Mosca: Institut Polytechnique de Paris
Oleg V. Yazyev: École Polytechnique Fédérale de Lausanne (EPFL)
Nicola A. Spaldin: ETH Zürich
Claude Ederer: ETH Zürich
Henrik M. Rønnow: École Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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 Ba2MgReO6. 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 Tq ~ 33 K. Using a variety of complementary first-principles-based computational techniques, we demonstrate that, while electronic interactions drive the ordering at Tq, 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.

Date: 2024
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DOI: 10.1038/s41467-024-53893-z

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