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

P. Pal; M. K. Dalai; I. Ulfat

doi:10.1016/j.susc.2011.01.031

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

Materials Science 2011-04-19 v1 Strongly Correlated Electrons

Authors: P. Pal , M. K. Dalai , I. Ulfat

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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.

Keywords

pseudogap Pr$_{0.5}$Sr$_{0.5}$MnO$_3$ photoemission Jahn-Teller polaron electron-phonon interaction charge ordering metal-insulator transition

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@article{arxiv.1104.3302,
  title  = {Pseudogap behavior in Pr$_{0.5}$Sr$_{0.5}$MnO$_3$: A photoemission study},
  author = {P. Pal and M. K. Dalai and I. Ulfat},
  journal= {arXiv preprint arXiv:1104.3302},
  year   = {2011}
}

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4 pages, 3 figures

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

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