Glassy Behavior and Isolated Spin Dimers in a New Frustrated Magnet BaCr^sub 9p^Ga^sub 12-9p^O^sub 19

Using bulk susceptibility and neutron scattering techniques, we have studied a new frustrated magnet, ..., with ... This system is isostructural to ..., in which the magnetic ... ions form a quasi-two-dimensional triangular lattice of bi-pyramids or kagome-triangle-kagome trilayers. Our bulk suscept...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2016-09, Vol.85 (9), p.1
Main Authors: Yang, Junjie, Samarakoon, Anjana M, Hong, Kyun Woo, Copley, John R D, Huang, Qingzhen, Tennant, Alan, Sato, Taku J, Lee, Seung-Hun
Format: Article
Language:English
Subjects:
Glass
Magnetism
Neutrons
Scattering
Temperature effects
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Summary:Using bulk susceptibility and neutron scattering techniques, we have studied a new frustrated magnet, ..., with ... This system is isostructural to ..., in which the magnetic ... ions form a quasi-two-dimensional triangular lattice of bi-pyramids or kagome-triangle-kagome trilayers. Our bulk susceptibility data exhibit glassy behavior at temperatures much lower than the absolute values of the Curie-Weiss temperature ... for BCGO(p = 0.902(8)). The frustration index ... is as high as 190 for BCGO(p = 0.902(8)) indicating strong frustration. Our inelastic neutron scattering data on BCGO(p = 0.902(8)) reveal a dispersionless magnetic excitation centered at ... meV, due to a singlet to triplet excitation of spin s = 3/2 dimers. The spin dimers are formed by ... ions in two ... layers that lie between 12k-2a-12k (kagome-triangle-kagome) trilayers. These results indicate that BCGO(p) is another good candidate system for a strongly frustrated quasi-two-dimensional magnet. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0031-9015
1347-4073