Pseudogap behavior in Pr0.5Sr0.5MnO3: A photoemission study |
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| Authors: | Prabir Pal MK Dalai I Ulfat |
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| Institution: | 1. Molecular and Condensed Matter Physics, Department of Physics and Astronomy, Uppsala University, Box 516, SE 751 21 Uppsala, Sweden;2. MAX-lab, Lund University, Box 118, SE-221 00, Lund, Sweden;3. National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110 012, India;4. Department of Applied Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden |
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| Abstract: | The valence band electronic structure of Pr0.5Sr0.5MnO3 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 Pr0.5Sr0.5MnO3 samples. |
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