The effects of structural and paramagnetic to ferromagnetic transition with the isovalent chemical substitution of smaller Ca2+ into the bigger Sr2+ sites in Lao0.6(Sr0.4-x) MnO3(0≤x≤0.4) are investigated. With increasing x, a change from the rhombohedral cell (space group: R-3c) to an orthorhombic cell (space group: Pbnm) is observed. For x≥0.3, the structural transformation leads to an increase of the Mn-O(1) bond length and the bending of the Mn-O-Mn bond along the c-axis which corresponds to the Jahn-Teller distortion of the distoned MnO6 octahedra in the orthorhombic cell. Such effects give rise to a decrease in Tc (the temperature of the paramagnetic to ferromagnetic transition) with increasing Ca content.
ASJC Scopus subject areas
- Materials Chemistry