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We report on the unconventional magnetism in the cubic B-site ordered doubleperovskite Ba2YMoO6, using AC and DC magnetic susceptibility, heat capacity andmuSR. No magnetic order is observed down to 2 K while the Weiss temperature is~ -160 K. This is ascribed to the geometric frustration in the lattice ofedge-sharing tetrahedra with orbitally degenerate Mo5+ s=1/2 spins. Ourexperimental results point to a gradual freezing of the spins into a disorderedpattern of spin-singlets, quenching the orbital degeneracy while leaving theglobal cubic symmetry unaffected, and providing a rare example of a valencebond glass.

Valence bond glass on an fcc lattice in the double perovskite Ba2YMoO6