Pr_0.6Ca_0.4MnO₃: From Low-Temperature Ordering to the Effects of Substrate-Induced Strain

Renewed interest in the perovskite manganites followed the initial report of a colossal magnetoresistance effect in a La_0.67Ca_0.33MnO₃ film. Yet, this effect is just one of the many fascinating phenomena exhibited by these materials. For example in bulk Pr_0.6Ca^0.4MnO₃, the ground state properties are determined by a balancing of several degrees of freedom that results in novel types of low-temperature ordering: a complicated charge and orbital ordering with associated lattice distortions occurs below a temperature of ~245 K, and at lower temperatures, magnetic ordering consisting of ferromagnetic zigzags-antiferromagnetically coupled-sets in. In Pr_0.6Ca_0.4MnO₃ films, substrate-induced strain can also affect the balancing of the various degrees of freedom, and can have significant effects on both the structure and low-temperature ordering. In this talk, I will describe studies of Pr_0.6Ca_0.4MnO₃-in both bulk and film form-which were carried out using several x-ray scattering techniques.

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