Pseudogap behavior in Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$: A photoemission study

Abstract

The valence band electronic structure of Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$ has been investigated across its paramagnetic metallic (PMM) - ferromagnetic metallic (FMM) - antiferromagnetic insulator (AFMI) transition. Using surface sensitive high resolution photoemission we have conclusively demonstrated the presence of a pseudogap of magnitude 80 meV in the near Fermi level electronic spectrum in the PMM and FMM phases and finite intensity at the Fermi level in the charge ordering (CO)-AFMI phase. The pseudogap behavior is explained in terms of the strong electron-phonon interaction and the formation of Jahn Teller (JT) polarons, indicating the charge localizations. The finite intensity at the Fermi level in the insulating phase showed a lack of charge ordering in the surface of the Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$ samples.

4 pages, 3 figures

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