Spectroscopic signatures and origin of hidden order in Ba₂MgReO₂
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 Ba₂MgReO₂ . Leveraging resonant and nonresonant 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.
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BibTeX
@article{soh2026spectroscopic,
title = {{Spectroscopic signatures and origin of hidden order in Ba₂MgReO₂}},
author = {Jian-Rui Soh and Maximilian E Merkel and Leonid V Pourovskii and Ivica Živković and Oleg Malanyuk and Jana Pásztorová and Sonia Francoual and Daigorou Hirai and Andrea Urru and Davor Tolj and Dario Fiore Mosca and Oleg V Yazyev and Nicola A Spaldin and Claude Ederer and Henrik M Rønnow},
journal = {Nature Communications},
year = {2026},
month = oct,
doi = {10.1038/s41467-024-53893-z},
url = {https://hal.science/hal-05784681v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Spectroscopic signatures and origin of hidden order in Ba₂MgReO₂
AU - Jian-Rui Soh
AU - Maximilian E Merkel
AU - Leonid V Pourovskii
AU - Ivica Živković
AU - Oleg Malanyuk
AU - Jana Pásztorová
AU - Sonia Francoual
AU - Daigorou Hirai
AU - Andrea Urru
AU - Davor Tolj
AU - Dario Fiore Mosca
AU - Oleg V Yazyev
AU - Nicola A Spaldin
AU - Claude Ederer
AU - Henrik M Rønnow
PY - 2026
DA - 2026/10/07
JO - Nature Communications
DO - 10.1038/s41467-024-53893-z
UR - https://hal.science/hal-05784681v1
AB - 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 Ba₂MgReO₂ . Leveraging resonant and nonresonant 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.
SN - 2041-1723
SN - 2041-1723
ER -