TY - JOUR
T1 - Chemical pressure controlled colossal magnetoresistance effects in Lao0.6(Sr0.4-xCax)MnO3
AU - Liu, R. S.
AU - Shen, C. H.
AU - Hu, Shu-Fen
PY - 2001/12/1
Y1 - 2001/12/1
N2 - 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.
AB - 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.
KW - A. oxides
KW - B. chemical synthesis
KW - D. crystal structure
KW - D. magnetic properties
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U2 - 10.1016/S1466-6049(01)00056-3
DO - 10.1016/S1466-6049(01)00056-3
M3 - Article
AN - SCOPUS:0035657010
VL - 3
SP - 1063
EP - 1072
JO - International Journal of Inorganic Materials
JF - International Journal of Inorganic Materials
SN - 1466-6049
IS - 7
ER -