Effects of charge doping on Mott insulator with strong spin-orbit coupling, Ba<sub>2</sub>Na<sub>1−x</sub>Ca<sub>x</sub>OsO<sub>6</sub>

Author(s)
Rong Cong, Erick Garcia, Paola C. Forino, Anna Tassetti, Giuseppe Allodi, Arneil P. Reyes, Phoung M. Tran, Patrick M. Woodward, Cesare Franchini, Samuele Sanna, Vesna F. Mitrović
Abstract

The effects of doping on the electronic evolution of the Mott insulating state have been extensively studied in efforts to understand mechanisms of emergent quantum phases of materials. The study of these effects becomes ever more intriguing in the presence of entanglement between spin and orbital degrees of freedom. Here, we present a comprehensive investigation of charge doping in the double perovskite Ba2NaOsO6, a complex Mott insulator where such entanglement plays an important role. We establish that the insulating magnetic ground state evolves from canted antiferromagnet (cAFM) [Lu et al., Nat. Commun. 8, 14407 (2017)] to Néel order for dopant levels exceeding ≈10%. Furthermore, we determine that a broken local point symmetry (BLPS) phase, precursor to the magnetically ordered state, occupies an extended portion of the (H−T) phase diagram with increased doping. This finding reveals that the breaking of the local cubic symmetry is driven by a multipolar order, most likely of the antiferro-quadrupolar type [Khaliullin et al., Phys. Rev. Res. 3, 033163 (2021); Churchill and Kee, Phys. Rev. B 105, 014438 (2022)]. Future dynamical measurements will be instrumental in determination of the precise nature of the identified multipolar order.

Organisation(s)
Computational Materials Physics
External organisation(s)
Brown University, University of Bologna, Università degli studi di Parma, National High Magnetic Field Laboratory, Ohio State University
Journal
Physical Review Materials
Volume
7
No. of pages
16
ISSN
2475-9953
DOI
https://doi.org/10.1103/PhysRevMaterials.7.084409
Publication date
08-2023
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics, 103017 Magnetism
Portal url
https://ucris.univie.ac.at/portal/en/publications/effects-of-charge-doping-on-mott-insulator-with-strong-spinorbit-coupling-ba2na1xcaxoso6(e19d95a4-2319-458c-a77f-01496e18044c).html