Charge ordering in electron-doped manganates

Santhosh, P. N. ; Arulraj, Anthony ; Vanitha, P. V. ; Singh, R. S. ; Sooryanarayana, K. ; Rao, C. N. R. (1999) Charge ordering in electron-doped manganates Journal of Physics: Condensed Matter, 11 (5). L27-L33. ISSN 0953-8984

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Electron-doped rare-earth manganates of the type Ca1−xLnxMnO3 (Ln=La, Nd, Gd or Y) with x=0.2 and 0.3 show charge ordering in the 150-270 K range, but the charge-ordering transition temperature, Tco, generally decreases with the decrease in the size of the A-site cations, a trend exactly opposite to that for hole-doped manganates. On the other hand, Tco increases with x or the electron concentration. These trends are also seen for Ca1−xLnxMnO3 compounds (Tco=300K for x=0.3) which show transitions to a more distorted orthorhombic structure below Tco. In Ca1−xLnxMnO3, Cr doping does not melt the charge-ordered state, unlike the case for the hole-doped systems. CaMnO2.82, for which electron doping is affected by anion vacancies, appears to show charge ordering at around 200 K.

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Deposited On:23 Jun 2011 04:03
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