Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/1052
Title: Occurrence of re-entrant ferromagnetic transitions in rare-earth manganates on cooling the charge-ordered states
Authors: Kundu, Asish K
Vanitha, P V
Rao, C N R
Keywords: magnetically ordered materials
electronic transport
LA0.5CA0.5MNO3
Phase
Site
Issue Date: 2003
Publisher: Pergamon-Elsevier Science Ltd
Citation: Solid State Communications 125(1), 41-44 (2003)
Abstract: Some of the compositions of the half-doped rare-earth manganates, La0.5−xLnxCa0.5MnO3 (Ln=Nd, Pr) and Nd0.5Ca0.5−xSrxMnO3 with relatively small A-cation radii, 〈rA〉, show an unusual behavior wherein they become ferromagnetic (FM) on cooling the charge ordered (CO) state (TCO>TC). With increase in 〈rA〉, however, the TC becomes greater than TCO. Thus, plots of TC and TCO against 〈rA〉 for La0.5−xLnxCa0.5MnO3 (Ln=Nd, Pr) and Nd0.5Ca0.5−xSrxMnO3 show cross-over from the TCO>TC regime to the TC>TCO regime around 〈rA〉 values of 1.195±0.003 and 1.200±0.005 Å, respectively. Between TC and TCO, the CO and FM phases are likely to coexist. In Nd0.5Ca0.5Mn1−xMxO3 (M=Cr, Ru), TCO>TC when x≤0.10, suggesting the re-entrant nature of the FM transition. (C) 2002 Elsevier Science Ltd. All rights reserved.
Description: Restricted Access
URI: http://hdl.handle.net/10572/1052
Other Identifiers: 0038-1098
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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