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• W1971072978 abstract "We investigate the high-temperature magnetic and transport properties of ${text{LaMn}}_{7}{text{O}}_{12}$, which displays a similar perovskitelike structure and the same single-valent ${text{Mn}}^{3+}$ properties of ${text{LaMnO}}_{3}$ but a much simpler Jahn-Teller (JT) distortion at ${T}_{text{JT}}=650text{ }text{K}$. We find that the magnetic response of ${text{LaMn}}_{7}{text{O}}_{12}$ is similar to that of ${text{LaMnO}}_{3}$ below ${T}_{text{JT}}$, but strikingly different in the undistorted phase above ${T}_{text{JT}}$, where the Curie-Weiss susceptibility is strongly suppressed. Electrical resistivity and thermopower measurements unveil a concomitant crossover from nonadiabatic to adiabatic small polaron regime. This suggests that the above suppression is due to low-spin electron-hole dimers formed by the ${e}_{g}$ charge transfer between Mn sites and stabilized by the slow JT dynamics above ${T}_{text{JT}}$." @default.
• W1971072978 created "2016-06-24" @default.
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• W1971072978 date "2010-06-09" @default.
• W1971072978 modified "2023-10-14" @default.
• W1971072978 title "Jahn-Teller-induced crossover of the paramagnetic response in the singly valent<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>e</mml:mi><mml:mi>g</mml:mi></mml:msub></mml:mrow></mml:math>system<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>LaMn</mml:mtext></mml:mrow><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:…" @default.
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• W1971072978 doi "https://doi.org/10.1103/physrevb.81.214412" @default.
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