Charge ordering and antiferromagnetic transitions in NdxCa1-xMnO3 (x= 0.2, 0.3) manganites

Joshi, Janhavi P. ; Bhagwat, Amar R. ; Sarangi, Subhasis ; Sharma, Ajay ; Bhat, S. V. (2004) Charge ordering and antiferromagnetic transitions in NdxCa1-xMnO3 (x= 0.2, 0.3) manganites Physica B: Condensed Matter, 349 (1-4). pp. 35-43. ISSN 0921-4526

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In this paper we present transport, magnetic and electron paramagnetic resonance (EPR) studies of electron doped manganites NdxCa1-xMnO3(x=0.2,0.3) with a view to compare and contrast their properties with those of the hole doped Nd0.5Ca0.5MnO3 and other manganites. The samples were prepared by the solid-state reaction method and the composition was verified using X-ray and EDAX measurements. Magnetization measurements on the x=0.2 sample (NCMO 0.2) show a peak at 155 K accompanied by a sharp increase in the resistivity. In the case of x=0.3 sample (NCMO 0.3) a peak in the magnetization along with an increase in the resistivity is observed at 220 K. From a comparison of the EPR results in the two compounds, we conclude that the transition in NCMO 0.2 is an antiferromagnetic transition which is likely to be a charge ordering transition as well and that in NCMO 0.3 is only a charge ordering transition at which long-range magnetic order is not established. We infer that in this compound the long-range antiferromagnetic order sets in at a much lower temperature below which the EPR signal disappears due to the opening of an antiferromagnetic gap.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Electron Paramagnetic Resonance; Rare Earth Manganites; Charge Ordering Transition; Antiferromagnetic Transition
ID Code:2820
Deposited On:09 Oct 2010 05:47
Last Modified:23 May 2011 06:04

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