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We have used atomic pair distribution function (PDF) analysis based on neutron powder diffraction data to investigate the local structure of the colossal magnetore- sistant manganite La0.75Ca0.25MnO3 as a function of tem- perature. In the doping range 0.17 < x < 0. 5t hese materi- als show a metal-to-insulator transition, transforming from a ferromagnetic metal (FM) at low temperature to a param- agnetic insulator (PI). We can probe the charge distribution of the sample using the PDF by searching for evidence of Jahn-Teller (JT) distorted octahedra, implying the presence of Mn 3+ ions. A two-phase model based on the local struc- tures of the FM and PI phases was used to refine the experi- mental PDFs quantitatively. We observe the co-existence of both phases over a wide temperature range: approximately 10% of the localized JT phase (PI) is present even at the lowest temperature (T = 20 K), whereas at room temperature nearly half of the sample remains in the delocalized (FM) phase.

Probing the Local Structure of Doped Manganites using the Atomic Pair Distribution Function