Competition between structural and electronic factors in (Al/In) doped lanthanum manganites
Ata-Allah, S. S.; Mostafa, M. F.; Heiba, zein Elabidin; Refai, H. S.;
Abstract
X-ray structure parameters of La0.7Ca0.3Mn 0.96(InxAl(1-x))0.04O3 perovskite manganites determined from the Rietveld analysis of the orthorhombic unit cell, space group Pbnm, showed strong dependence on x. Resistivity (ρ) and ac magnetic susceptibility (χ) measurements showed decrease in the metallic-to-semiconductor transition temperature Tρ and the ferromagnetic-to-paramagnetic Curie temperature TC as x increases. The large drop in Tρ and TC for x=0.0 and 1.0 is ascribed to the difference between the electronic configuration (E-factor) and ionic radius (structure factor) of the dopants and the Mn3 ions. Decrease in Tρ and TC for samples (0.2
Other data
| Title | Competition between structural and electronic factors in (Al/In) doped lanthanum manganites | Authors | Ata-Allah, S. S.; Mostafa, M. F.; Heiba, zein Elabidin ; Refai, H. S. | Keywords | Double exchange;Electronic factor;JahnTeller effect;Manganites;Structural parameters;Structure factor | Issue Date | 1-Feb-2011 | Journal | Physica B: Condensed Matter | Volume | 406 | Issue | 4 | Start page | 801 | End page | 811 | ISSN | 09214526 | DOI | 10.1016/j.physb.2010.11.097 | Scopus ID | 2-s2.0-78751641302 |
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