We report a detailed structural and magnetic investigation of the spin-ladder compound ${\mathrm{Ba}}_2{\mathrm{CuTeO}}_6$ using neutron and synchrotron diffraction techniques, along with magnetic susceptibility measurements. High-resolution neutron and synchrotron powder diffraction reveal a structural phase transition from monoclinic $C$2/$m$ to triclinic $P\overline{1}$ symmetry below $\sim 275\mathrm{K}$, driven by octahedral distortions that alter the Cu-O-Te-O-Cu super-superexchange pathways. At low temperatures, ${\mathrm{Ba}}_2{\mathrm{CuTeO}}_6$ undergoes long-range antiferromagnetic ordering below the Néel temperature $T_N\approx 15\mathrm{K}$, confirmed by both powder and single-crystal neutron diffraction. The magnetic ordering is characterized by a commensurate propagation vector $\mathbf{k}=(0.5,0.5,0.5)$ and a reduced ordered moment of $\sim 0.48{\mu }_B$ per ${\mathrm{Cu}}^{2+}$ ion. These findings demonstrate that structural symmetry lowering modifies exchange anisotropy sufficiently to stabilize magnetic order in an otherwise low-dimensional system. These results establish ${\mathrm{Ba}}_2{\mathrm{CuTeO}}_6$ as a model platform for exploring dimensional crossover, exchange anisotropy, and structure-driven quantum magnetism in spin-ladder materials.

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• Magnetic coupling
• Magnetic order
• Magnetic susceptibility
• Antiferromagnets
• Single crystal materials
• Density functional theory
• Neutron diffraction