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- W1977040870 abstract "A positive muon spin rotation and relaxation $({ensuremath{mu}}^{+}mathrm{SR})$ experiment on $[{mathrm{Ca}}_{2}{mathrm{CoO}}_{3}{]}_{0.62}[{mathrm{CoO}}_{2}]$ (i.e., ${mathrm{Ca}}_{3}{mathrm{Co}}_{4}{mathrm{O}}_{9},$ a layered thermoelectric cobaltite) indicates the existence of two magnetic transitions at $ensuremath{sim}100mathrm{K}$ and 400--600 K; the former is a transition from a paramagnetic state to an incommensurate (IC) spin-density wave (SDW) state. The anisotropic behavior of zero-field ${ensuremath{mu}}^{+}mathrm{SR}$ spectra at 5 K suggests that the IC-SDW propagates in the $aensuremath{-}b$ plane, with oscillating moments directed along the c axis; also the IC-SDW is found to exist not in the $[{mathrm{Ca}}_{2}{mathrm{CoO}}_{3}]$ subsystem but in the $[{mathrm{CoO}}_{2}]$ subsystem. In addition, it is found that the long-range IC-SDW order completes below $ensuremath{sim}30mathrm{K},$ whereas the short-range order appears below 100 K. The latter transition is interpreted as a gradual change in the spin state of Co ions above 400 K. These two magnetic transitions detected by ${ensuremath{mu}}^{+}mathrm{SR}$ are found to correlate closely with the transport properties of $[{mathrm{Ca}}_{2}{mathrm{CoO}}_{3}{]}_{0.62}[{mathrm{CoO}}_{2}].$" @default.
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- W1977040870 date "2003-10-15" @default.
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- W1977040870 title "Hidden magnetic transitions in the thermoelectric layered cobaltite<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mo>[</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CoO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>]</mml:mo></mml:…" @default.
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- W1977040870 doi "https://doi.org/10.1103/physrevb.68.134423" @default.
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