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• W2022040788 abstract "The effects of the cooperative Jahn-Teller effect on the crystal structure and the stability of the charge-ordered ($text{CO}$) state were studied by measurements of powder x-ray diffraction, resistivity, and ultrasound for ${text{Pr}}_{1ensuremath{-}x}{text{Ca}}_{x}{text{MnO}}_{3}$ $(0.5ensuremath{leqslant}xensuremath{leqslant}0.875)$. Powder x-ray diffraction revealed a change of the crystal structure from tetragonally compressed to tetragonally elongated orthorhombic between $x=0.75$ and $x=0.8$ in the $text{CO}$ state, resulting from the crossover of the cooperative Jahn-Teller vibration mode from ${Q}_{2}$ to ${Q}_{3}$. The relative stiffening of the ultrasound $(ensuremath{Delta}V∕V)$ reflecting the magnitude of the cooperative Jahn-Teller lattice distortion in the $text{CO}$ state increases with increasing $x$ from 0.5 to 0.625, reaching its maximum and being almost $x$ independent for $0.625ensuremath{leqslant}xensuremath{leqslant}0.8$, and drops steeply with further increase of $x$. Coincident with the variation of $ensuremath{Delta}V∕V$ with $x$, the stability of the $text{CO}$ state reflected by the magnetoresistance effect increases with increasing $x$ from 0.5 to 0.625, reaching the most stable for $0.625ensuremath{leqslant}xensuremath{leqslant}0.825$, and becomes unstable with further increase of $x$. These features demonstrate that the cooperative Jahn-Teller lattice distortion is one of the key ingredients in understanding the essential physics of the $text{CO}$ state in manganites." @default.
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• W2022040788 date "2004-07-09" @default.
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• W2022040788 title "Transport, ultrasound, and structural properties for the charge-ordered<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:msub><mml:mtext>Ca</mml:mtext><mml:mi>x</mml:mi></mml:msub></mml:mrow><mml:mrow /></mml:msub><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:…" @default.
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• W2022040788 doi "https://doi.org/10.1103/physrevb.70.014408" @default.
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