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Valence bond glass state in the 4\(d^1\) fcc antiferromagnet Ba\(_2\)LuMoO\(_6\)

\(B\)-site ordered 4\(d^1\) and 5\(d^1\) double perovskites have a number of potential novel 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 geometri...

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Published in:arXiv.org 2022-05
Main Authors: Mustonen, O, Mutch, H, Walker, H C, Baker, P J, Coomer, F C, Perry, R S, Pughe, C, Stenning, G B G, Liu, C, Dutton, S E, Cussen, E J
Format: Article
Language:English
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Summary:\(B\)-site ordered 4\(d^1\) and 5\(d^1\) double perovskites have a number of potential novel 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 4\(d^1\) Mo\(^{5+}\) perovskite Ba\(_2\)YMoO\(_6\) has been suggested to have a valence bond glass ground state. Here we report on the low temperature properties of powder samples of isostructural Ba\(_2\)LuMoO\(_6\): the only other known cubic 4\(d^1\) 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 \(\Delta\) = 28 meV is observed in inelastic neutron scattering. These results are interpreted as a disordered valence bond glass ground state similar to Ba\(_2\)YMoO\(_6\). Our results highlight the differences of the 4\(d^1\) double perovskites in comparison to cubic 5\(d^1\) analogues, which have both magnetic and multipolar order.
ISSN:2331-8422
DOI:10.48550/arxiv.2108.02209