Abstract
We present the results of the kilohertz mechanical spectrum of oxygen-varied La1/3Sr2/3FeO3−δ and Pr1/3Sr2/3FeO3−δ. On cooling, a substantial modulus softening above the charge ordering transition temperature TCO, and an abrupt stiffness and step-like decrease of the internal friction below TCO were observed in oxygen stoichiometric La1/3Sr2/3FeO3−δ. No step-like change of the mechanical spectrum was observed in charge-ordered Pr1/3Sr2/3FeO3−δ, which shows the absence of dynamic Jahn-Teller distortions in Pr1/3Sr2/3FeO3−δ. Another modulus softening below was observed in charge-ordered (La, Pr)1/3Sr2/3FeO3−δ, which was used to discriminate the charge ordering transition from the charge disproportionation transition in perovskite iron oxides.
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