Valence bond glass on an fcc lattice in the double Perovskite Ba2YMoO6.
Phys Rev Lett
; 104(17): 177202, 2010 Apr 30.
Article
de En
| MEDLINE
| ID: mdl-20482134
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 approximately -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.
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Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Phys Rev Lett
Année:
2010
Type de document:
Article
Pays d'affiliation:
Royaume-Uni