Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-01-04
Phys. Rev. Lett. 104, 177202 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures. Published in Phys. Rev. Lett.
Scientific paper
10.1103/PhysRevLett.104.177202
We report on the unconventional magnetism in the cubic B-site ordered double perovskite Ba2YMoO6, using AC and DC magnetic susceptibility, heat capacity and muSR. 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 of edge-sharing tetrahedra with orbitally degenerate Mo5+ s=1/2 spins. Our experimental results point to a gradual freezing of the spins into a disordered pattern of spin-singlets, quenching the orbital degeneracy while leaving the global cubic symmetry unaffected, and providing a rare example of a valence bond glass.
Bos J-W. G.
de Vries Mark A.
McLaughlin Craig A.
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