Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6 by Macdougal, D, Gibbs, A, Ying, T, Wessel, S, Walker, H, Voneshen, D, Mila, F, Takagi, H, Coldea, R

“…We report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromagnetic two-leg spin-1/2 ladders. Isolated ladders are expected to have a singlet ground state protected by a spin gap. …”