| Autor: |
Joshi, Janhavi P, Bhagwat, Amar R, Sarangi, Subhasis, Sharma, Ajay, Bhat, SV |
| Jazyk: |
angličtina |
| Rok vydání: |
2004 |
| Předmět: |
|
| Zdroj: |
IndraStra Global. |
| ISSN: |
2381-3652 |
| Popis: |
In this paper we present transport, magnetic and electron paramagnetic resonance (EPR) studies of electron doped manganites $Nd_xCa_{1-x}MnO_3(x = 0.2, 0.3)$ with a view to compare and contrast their properties with those of the hole doped $Nd_{0.5}Ca_{0.5}MnO_3$ 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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