Author(s): Dario Fiore Mosca, Lorenzo Celiberti, Leonid V. Pourovskii, and Cesare Franchini We investigate how doping-induced small polarons impact the low-temperature multipolar orders of the $5{d}^{2}$ double perovskite ${\mathrm{Ba}}_{2}{\mathrm{CaOsO}}_{6}$. By computing intersite exchange interactions between $5{d}^{1}$ localized hole polarons and $5{d}^{2}$ magnetic ions from first p… [Phys. Rev. Lett. 137, 046504] Published Wed Jul 22, 2026