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• W2963661138 abstract "This study reports atomic-scale characterization of structural defects in Yb2Ti2O7, a pyrochlore oxide whose subtle magnetic interactions is prone to small perturbations. Due to discrepancies in the reported magnetic ground states, it has become a pressing issue to determine the nature of defects in this system. In the present study, we use atomic resolution scanning transmission electron microscopy techniques to identify the type of defects in the ytterbium titanate single crystals grown by the conventional optical floating zone (FZ) method. In addition to the known point defects of substitution Yb on Ti B-sites, extended defects such as dissociated superdislocations and anti-phase boundaries were discovered for the first time in this material. Such defects were prevalently observed in the FZ grown single crystals (of a darker color), in contrast to the stoichiometric white polycrystalline powders or high quality colorless single crystals grown by the traveling solvent floating zone technique. The lattice strains from these extended defects result in distortions of Yb-tetrahedron. A change of Ti valance was not detected at the defects. Our findings provide new insights into understanding the nature of defects that are of great importance for the physical property studies of geometrically frustrated compounds. Furthermore, this work sheds light on the complicated core structure of superdislocations that have large Burgers vectors in oxides with complex unit cells." @default.
• W2963661138 created "2019-07-30" @default.
• W2963661138 creator A5010044705 @default.
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• W2963661138 date "2018-11-21" @default.
• W2963661138 modified "2023-10-12" @default.
• W2963661138 title "Superdislocations and point defects in pyrochlore Yb2Ti2O7 single crystals and implication on magnetic ground states" @default.
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• W2963661138 doi "https://doi.org/10.1038/s41598-018-35283-w" @default.
• W2963661138 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6249211" @default.
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• W2963661138 hasPublicationYear "2018" @default.
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