Emergence of Subdominant Quadrupolar Order in the 5$d^2$ Multipolar Mott Insulator Ba${}_2$CaOsO${}_6$

Ilija K. Nikolov, Giuseppe Allodi, Ginevra Corsale +5

Relativistic $5d$ Mott insulators host a rich variety of exotic hidden multipolar order, whose microscopic nature remains heavily debated. A broken local point-symmetry (BLPS) phas…