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

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jats:titleAbstract</jats:title>jats:pjats:italicB</jats:italic>-site ordered 4jats:italicd</jats:italic>jats:sup1</jats:sup> and 5jats:italicd</jats:italic>jats:sup1</jats:sup> 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 jats:italicJ</jats:italic>jats:subeff</jats:sub> = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4jats:italicd</jats:italic>jats:sup1</jats:sup> Mojats:sup5+</jats:sup> perovskite Bajats:sub2</jats:sub>YMoOjats:sub6</jats:sub> has been suggested to have a valence bond glass ground state. Here we report on the low temperature properties of powder samples of isostructural Bajats:sub2</jats:sub>LuMoOjats:sub6</jats:sub>: the only other known cubic 4jats:italicd</jats:italic>jats:sup1</jats:sup> 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 Bajats:sub2</jats:sub>YMoOjats:sub6</jats:sub>. Our results highlight the differences of the 4jats:italicd</jats:italic>jats:sup1</jats:sup> double perovskites in comparison to cubic 5jats:italicd</jats:italic>jats:sup1</jats:sup> analogues, which have both magnetic and multipolar order.</jats:p>



51 Physical Sciences

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npj Quantum Materials

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Springer Science and Business Media LLC
Engineering and Physical Sciences Research Council (EP/M000524/1)
EPSRC (EP/T028580/1)
Engineering and Physical Sciences Research Council (EP/P024947/1)
Engineering and Physical Sciences Research Council (EP/S019367/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
EPSRC (via University of Manchester) (EP/X527257/1)