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Internal Chemical Pressure Effect and Magnetic Properties of La0.6(Sr0.4−xBax)MnO3

✍ Scribed by C.H. Shen; C.C. Chen; R.S. Liu; R. Gundakaram; S.F. Hu; J.M. Chen

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
229 KB
Volume
156
Category
Article
ISSN
0022-4596

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✦ Synopsis

The e4ect of isovalent chemical substitution of Ba 2؉ into the Sr 2؉ sites on the structural and magnetic transition in La 0.6 (Sr 0.4؊x Ba x )MnO 3 (x ‫؍‬ 0+0.4) has been investigated. The rhombohedral structure with space group R؊3c is observed in this series of materials. Substitution of Sr and Ba in the La site changes the structural parameters such as the Mn+O bond lengths, thus allowing the study of the e4ect of the structure on magnetic properties. An increase in the Mn+O bond distance with increasing Ba content leads to a decrease in T C (the temperature of the paramagnetic to ferromagnetic transition). 2001 Academic Press

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The effect of oxygen content on the electrical transport properties of La 0.4 Ca 0.6 MnO 3--y was studied. Upon decreasing oxygen content, the lattice parameters a, b and c of the samples increase and the electrical resistivity of the samples also increases abruptly, contradicting what is expected i