Abstract
We have measured the temperature dependence of internal friction Q−1(T), Young's modulus E(T), and resistivity ρ(T) in situ along with the measurements of magnetization M(T) on optimally doped manganites La0.67Ca0.33MnOy with different oxygen contents. With the reduction of the oxygen content y, the Q−1 peak in the paramagnetic region, suggested to originate from the formation of the magnetic clusters (MC), shifts to a lower temperature and its magnitude decreases and finally disappears. The results of M(T) and ρ(T) indicates that both the effective magnetic moment μeff and the hopping distance of electrons decrease with the increase of oxygen vacancies, which may suppress the MC. In addition, the analysis of the results of E(T) indicates that the cooperative effects of lattice distortions may favour the formation of MC.
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