Valence bond glass state in the 4d1 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

Valence bond glass state in the 4d¹ 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^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

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Abstract

B-site ordered 4d¹ and 5d¹ 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 4d¹ 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 4d¹ 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 4d¹ double perovskites in comparison to cubic 5d¹ analogues, which have both magnetic and multipolar order.

Original language	English
Article number	74
Number of pages	9
Journal	npj Quantum Materials
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41535-022-00480-4
Publication status	Published - 27 Jul 2022

Bibliographical note

Funding Information:
O.M., H.M., C.P., and E.J.C. are grateful for support from the Leverhulme Trust Research Project Grant RPG-2017-109. O.M. is grateful for funding through Leverhulme Trust Early Career Fellowship ECF-2021-170. S.E.D. acknowledges funding from the Winton Programme for the Physics of Sustainability (Cambridge) and EPSRC (EP/T028580/1). The authors thank the Science and Technology Facilities Council for the beamtime allocated at ISIS. The authors are grateful for access to the MPMS3 instrument at the ISIS Materials Characterisation Laboratory. Heat Capacity measurements were performed using the Advanced Materials Characterisation Suite, funded by EPSRC Strategic Equipment Grant EP/M000524/1. We thank Dr Daigorou Hirai for fruitful discussions on fitting the lattice-specific heat.

Publisher Copyright:
© 2022, The Author(s).

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1038/s41535-022-00480-4Licence: Creative Commons: Attribution (CC BY)

MustonenO2022ValenceFinal published version, 1.53 MBLicence: Creative Commons: Attribution (CC BY)

Exploring Quantum Criticality Through Chemical Design (Otto Mustonen)
Clark, L. & Mustonen, O.
Leverhulme Trust
1/11/21 → 31/10/24
Project: Research

Cite this

@article{d37e040f9de84fec9de50b3c41317c7c,

title = "Valence bond glass state in the 4d1 fcc antiferromagnet Ba2LuMoO6",

abstract = "B-site ordered 4d1 and 5d1 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 Jeff = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4d1 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 4d1 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 4d1 double perovskites in comparison to cubic 5d1 analogues, which have both magnetic and multipolar order.",

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

note = "Funding Information: O.M., H.M., C.P., and E.J.C. are grateful for support from the Leverhulme Trust Research Project Grant RPG-2017-109. O.M. is grateful for funding through Leverhulme Trust Early Career Fellowship ECF-2021-170. S.E.D. acknowledges funding from the Winton Programme for the Physics of Sustainability (Cambridge) and EPSRC (EP/T028580/1). The authors thank the Science and Technology Facilities Council for the beamtime allocated at ISIS. The authors are grateful for access to the MPMS3 instrument at the ISIS Materials Characterisation Laboratory. Heat Capacity measurements were performed using the Advanced Materials Characterisation Suite, funded by EPSRC Strategic Equipment Grant EP/M000524/1. We thank Dr Daigorou Hirai for fruitful discussions on fitting the lattice-specific heat. Publisher Copyright: {\textcopyright} 2022, The Author(s).",

year = "2022",

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doi = "10.1038/s41535-022-00480-4",

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T1 - Valence bond glass state in the 4d1 fcc antiferromagnet Ba2LuMoO6

AU - Mustonen, O. H.J.

AU - Mutch, H. M.

AU - Walker, H. C.

AU - Baker, P. J.

AU - Coomer, F. C.

AU - Perry, R. S.

AU - Pughe, C.

AU - Stenning, G. B.G.

AU - Liu, C.

AU - Dutton, S. E.

AU - Cussen, E. J.

N1 - Funding Information: O.M., H.M., C.P., and E.J.C. are grateful for support from the Leverhulme Trust Research Project Grant RPG-2017-109. O.M. is grateful for funding through Leverhulme Trust Early Career Fellowship ECF-2021-170. S.E.D. acknowledges funding from the Winton Programme for the Physics of Sustainability (Cambridge) and EPSRC (EP/T028580/1). The authors thank the Science and Technology Facilities Council for the beamtime allocated at ISIS. The authors are grateful for access to the MPMS3 instrument at the ISIS Materials Characterisation Laboratory. Heat Capacity measurements were performed using the Advanced Materials Characterisation Suite, funded by EPSRC Strategic Equipment Grant EP/M000524/1. We thank Dr Daigorou Hirai for fruitful discussions on fitting the lattice-specific heat. Publisher Copyright: © 2022, The Author(s).

PY - 2022/7/27

Y1 - 2022/7/27

N2 - B-site ordered 4d1 and 5d1 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 Jeff = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4d1 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 4d1 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 4d1 double perovskites in comparison to cubic 5d1 analogues, which have both magnetic and multipolar order.

AB - B-site ordered 4d1 and 5d1 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 Jeff = 3/2 pseudospins on the geometrically frustrated fcc lattice. The 4d1 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 4d1 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 4d1 double perovskites in comparison to cubic 5d1 analogues, which have both magnetic and multipolar order.

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