Cu-Sb dumbbell arrangement in the spin-orbital liquid candidate Ba${}_3$CuSb${}_2$O${}_9$

Michaela Altmeyer, Frederic Mila, Andrew Smerald +1

The absence of both spin freezing and of a static Jahn-Teller effect have lead to the proposition that Ba${}_3$CuSb${}_2$O${}_9$ is a quantum spin-orbital liquid. However, theoretical un…