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• W2185014566 abstract "The nature of the magnetic state of $mathrm{Li}mathrm{Ni}{mathrm{O}}_{2}$ has been controversial. In this compound Ni spins $(S=1∕2)$ form a triangular lattice with the possibility of magnetic frustration, but the exact state of spin correlation has not yet been known in spite of the extensive research work. A factor that complicates understanding of the magnetic state is the orbital state of ${mathrm{Ni}}^{3+}$ which is a Jahn-Teller (JT) ion. While there is no signature of long-range Jahn-Teller distortion, local JT distortion has been suspected. We have performed neutron diffraction and atomic pair-density function analyses up to unprecedented large distances to discover a number of unusual features, such as anomalous peak broadening, local JT distortion, sharp oxygen-oxygen distance correlations, and inverted temperature dependence of medium range correlation. These observations are best explained by local orbital ordering of ${mathrm{Ni}}^{3+}$ ions into three sublattices. This orbital ordering, however, cannot develop into long-range order because of the strain field it generates, and domains of about $10phantom{rule{0.3em}{0ex}}mathrm{nm}$ in size are formed. Domains are susceptible to random pinning by impurities (site disorder) resulting in the loss of structural long-range order. We suggest that this local orbital ordering is the basis for the complex magnetic properties observed in this compound." @default.
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• W2185014566 date "2005-02-22" @default.
• W2185014566 modified "2023-10-01" @default.
• W2185014566 title "Local structure of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Li</mml:mi><mml:mi mathvariant=normal>Ni</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>studied by neutron diffraction" @default.
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• W2185014566 doi "https://doi.org/10.1103/physrevb.71.064410" @default.
• W2185014566 hasPublicationYear "2005" @default.
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