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- W2068630226 abstract "The results of synchrotron x-ray-diffraction and magnetization measurements on a triangular lattice antiferromagnet $mathrm{Cu}mathrm{Fe}{mathrm{O}}_{2}$ under pulsed high magnetic fields are reported. This material exhibits a distorted triangular lattice structure below $ensuremath{sim}11phantom{rule{0.3em}{0ex}}mathrm{K}$ to relieve partially the geometric frustration. We find stepwise changes in the lattice constants, associated with the magnetization changes parallel $({H}^{ensuremath{Vert}})$ and perpendicular $({H}^{ensuremath{perp}})$ to the trigonal $c$ axis. The relative changes in the lattice constant $b$ with ${H}^{ensuremath{Vert}}$ are reproduced by a calculation based on a model in which the number of bonds connecting two parallel spins along the $b$ axis increases with increasing field and the lattice contracts to gain the ferromagnetic direct and antiferromagnetic superexchange energies. For ${H}^{ensuremath{perp}}$, we find a discontinuous change in $b$ and $c$ at $ensuremath{sim}24phantom{rule{0.3em}{0ex}}mathrm{T}$, and a plateau in $b$ and $c$ at $24<{H}^{ensuremath{perp}}<30phantom{rule{0.3em}{0ex}}mathrm{T}$. The change in $b$ with increasing ${H}^{ensuremath{perp}}$ agrees also with the same calculation. We discuss the anisotropic behavior in $mathrm{Cu}mathrm{Fe}{mathrm{O}}_{2}$ observed at the low fields and find that the anisotropy is closely correlated with the lattice distortion." @default.
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- W2068630226 date "2007-06-11" @default.
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- W2068630226 title "Correlation between crystal structure and magnetism in the frustrated antiferromagnet<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi><mml:mi mathvariant=normal>Fe</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>under high magnetic fields" @default.
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- W2068630226 doi "https://doi.org/10.1103/physrevb.75.224411" @default.
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