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A 57Fe Mossbauer study of charge ordering and phase separation in the rare-earth manganates, Nd0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3

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dc.contributor.author Vanitha, P V
dc.contributor.author Nagarajan, R
dc.contributor.author Rao, C N R
dc.date.accessioned 2012-11-23T10:34:23Z
dc.date.available 2012-11-23T10:34:23Z
dc.date.issued 2003-08
dc.identifier 0022-4596 en_US
dc.identifier.citation Journal of Solid State Chemistry 174(1), 74-79 (2003) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1058
dc.description Restricted Access en_US
dc.description.abstract Mössbauer studies of 2% 57Fe-doped Nd0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3 have been carried out over the 4.2–300 K range after ensuring that such doping does not change their basic properties. The charge-ordering transition in these manganates is marked by abrupt changes in the quadrupole splitting. In the case of Nd0.5Ca0.5MnO3, two phases manifest themselves on cooling below the charge-ordering transition temperature. The evolution of the spectra as a function of temperature shows that long-range magnetic order does not occur sharply. The observed evolution with temperature is different in the two materials studied. In Nd0.5Ca0.5Mn0.9857Fe0.02O3, it resembles that of a disordered magnetic material, whereas the temperature dependence of line shape of Nd0.5Sr0.5Mn0.9857Fe0.02O3 is typical of a superparamagnetically relaxed magnetic system. Although both the manganates show well-resolved magnetic hyperfine spectra at 4.2 K, the lines are slightly broad indicating possible coexistence of phases at low temperatures. A weak paramagnetic signal is also seen in the spectra of both the manganates at 4.2 K. en_US
dc.description.uri http://dx.doi.org/10.1016/S0022-4596(03)00177-4 en_US
dc.language.iso en en_US
dc.publisher Academic Press Inc Elsevier Science en_US
dc.rights © 2003 Elsevier Science en_US
dc.subject rare-earth manganates en_US
dc.subject charge ordering en_US
dc.subject magnetic disorder en_US
dc.subject superparamagnetism en_US
dc.subject Fe-57 Mossbauer spectroscopy en_US
dc.subject phase separation en_US
dc.title A 57Fe Mossbauer study of charge ordering and phase separation in the rare-earth manganates, Nd0.5Ca0.5MnO3 and Nd0.5Sr0.5MnO3 en_US
dc.type Article en_US


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