Abstract
This chapter describes interesting experimental results that support the theory of phase separation for manganites outlined in this book. The information presented here was gathered using a variety of techniques, convincingly showing the existence of charge-ordered nanoclusters above the Curie temperature of CMR ferromagnetic manganites. In addition, it has been shown in many experimental measurements that the “strength” of these clusters correlates with the resistivity, both as a function of temperature at zero magnetic field and as a function of magnetic field at constant temperature. These experimental investigations have also shown that free polarons exist in the paramagnetic insulating (PI) state, but their presence does not seem correlated with the magnetotransport CMR phenomenon. The key feature of the PI state that induces the well-known MR behavior of its resistivity appears to be the charge-ordered nanoclusters described here. This result, if confirmed, would provide key support to the theory of manganites that is based on mixed-phase tendencies, and would rule out theories based on a gas of uncorrelated small polarons in the PI state. Work in the near future will hopefully further clarify these issues. It is recommended that the results of this chapter should be read in combination with those of some previous chapters, such as Chap. 11, where experimental evidence for inhomogeneities was presented.
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Dagotto, E. (2003). Charge-Ordered Nanoclusters above T C: the Smoking Gun of Phase Separation?. In: Nanoscale Phase Separation and Colossal Magnetoresistance. Springer Series in Solid-State Sciences, vol 136. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05244-0_19
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DOI: https://doi.org/10.1007/978-3-662-05244-0_19
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