Valence bond glass state in the 4d 1 fcc antiferromagnet Ba2LuMoO6

O. H. J. Mustonen; H. M. Mutch; H. C. Walker; P. J. Baker; F. C. Coomer; R. S. Perry; C. Pughe; G. B. G. Stenning; C. Liu; S. E. Dutton; E. J. Cussen

doi:10.1038/s41535-022-00480-4

npj Quantum Materials (Jul 2022)

Valence bond glass state in the 4d 1 fcc antiferromagnet Ba2LuMoO6

O. H. J. Mustonen,
H. M. Mutch,
H. C. Walker,
P. J. Baker,
F. C. Coomer,
R. S. Perry,
C. Pughe,
G. B. G. Stenning,
C. Liu,
S. E. Dutton,
E. J. Cussen

Affiliations

O. H. J. Mustonen: Department of Material Science and Engineering, University of Sheffield
H. M. Mutch: Department of Material Science and Engineering, University of Sheffield
H. C. Walker: ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus
P. J. Baker: ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus
F. C. Coomer: Afton Chemical Ltd., Bracknell
R. S. Perry: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London
C. Pughe: Department of Material Science and Engineering, University of Sheffield
G. B. G. Stenning: ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus
C. Liu: Cavendish Laboratory, University of Cambridge
S. E. Dutton: Cavendish Laboratory, University of Cambridge
E. J. Cussen: Department of Material Science and Engineering, University of Sheffield

DOI: https://doi.org/10.1038/s41535-022-00480-4
Journal volume & issue: Vol. 7, no. 1
pp. 1 – 9

Abstract

Read online

Abstract B-site ordered 4d 1 and 5d 1 double perovskites have a number of potential exotic ground states including multipolar order, quantum spin liquids and valence bond glass states. These arise from the complex interactions of spin-orbital entangled J eff = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4d 1 Mo5+ perovskite Ba2YMoO6 has been suggested to have a valence bond glass ground state. Here we report on the low temperature properties of powder samples of isostructural Ba2LuMoO6: the only other known cubic 4d 1 perovskite with one magnetic cation. Our muon spectroscopy experiments show that magnetism in this material remains dynamic down to 60 mK without any spin freezing or magnetic order. A singlet-triplet excitation with a gap of Δ = 28 meV is observed in inelastic neutron scattering. These results are interpreted as a disordered valence bond glass ground state similar to Ba2YMoO6. Our results highlight the differences of the 4d 1 double perovskites in comparison to cubic 5d 1 analogues, which have both magnetic and multipolar order.

Published in npj Quantum Materials

ISSN: 2397-4648 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials; Science: Physics: Atomic physics. Constitution and properties of matter
Website: https://www.nature.com/npjquantmats/

About the journal