Journal Article

FZJ-2019-00738

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Universal geometric frustration in pyrochlores

Trump, B. A. ; Koohpayeh, S. M. ; Livi, K. J. T. ; Wen, J.-J. ; Arpino, K. E. ; Ramasse, Q. M. ; Brydson, R. ; Feygenson, M.FZJ* ; Takeda, H. ; Takigawa, M. ; Kimura, K. ; Nakatsuji, S. ; Broholm, C. L. ; McQueen, T. M. (Corresponding author)

2018
Nature Publishing Group UK [London]

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Please use a persistent id in citations: http://hdl.handle.net/2128/21380  doi:10.1038/s41467-018-05033-7

Abstract: Materials with the pyrochlore/fluorite structure have diverse technological applications, from magnetism to nuclear waste disposal. Here we report the observation of structural instability present in the pyrochlores A2Zr2O6Oʹ (A = Pr, La) and Yb2Ti2O6Oʹ, that exists despite ideal stoichiometry, ideal cation-ordering, the absence of lone pair effects, and a lack of magnetic order. Though these materials appear to have good long-range order, local structure probes find displacements, of the order of 0.01 nm, within the pyrochlore framework. The pattern of displacements of the A2Oʹ sublattice mimics the entropically-driven fluxional motions characteristic of and well-known in the silica mineral β-cristobalite. The universality of such displacements within the pyrochlore structure adds to the known structural diversity and explains the extreme sensitivity to composition found in quantum spin ices and the lack of ferroelectric behavior in pyrochlores.

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Contributing Institute(s):

1. Neutronenstreuung (ICS-1)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)

Research Program(s):

1. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
3. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)

Appears in the scientific report 2018

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