Valence Bond Glass on an fcc Lattice in the Double Perovskite Ba2YMoO6

Mark A. de Vries, Abbie McLaughlin, J-W G. Bos

Research output: Contribution to journalArticlepeer-review

Abstract

We report on the unconventional magnetism in the cubic B-site ordered double perovskite Ba2YMoO6, using ac and dc magnetic susceptibility, heat capacity and muon spin rotation. 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 Mo 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.
Original languageEnglish
Article number177202
Number of pages4
JournalPhysical Review Letters
Volume104
Issue number17
DOIs
Publication statusPublished - 27 Apr 2010

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