Abstract
A study of La 0.6Sr 0.4− x MnTi x O 3 ( x = 0.0 , 0.05, 0.1, 0.15, and 0.2) manganites with the Ti in B(=Mn)-position and vacancies in A(=La, Sr)-site is presented. The manganites belonged to the rhombohedral phase and small amount of Mn 3O 4 oxide was observed with increase of Ti content. X-ray adsorption fine structure (XAFS) analysis showed an appearance of Mn 2+ ions in perovskite cell and tremendous change of local structure. We suppose that the change of local structure was mainly caused by the appearance of Mn ions in the A-positions and partially by the formation of vacancies in the above position with the increase of x-value. Curie temperature, T C , decreased drastically with x: T C ( x = 0 ) = 355 K and, T C ( x = 0.05 ) = 185 K . Further increase of Ti content changed the low-temperature magnetic state from the ferromagnetic to spin/cluster glass state. Effects of destruction of the e g electron pathway and change of local structure on Curie temperature, caused by the Ti doping, is discussed.
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