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Pseudogap behavior in Pr0.5Sr0.5MnO3: A photoemission study
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2011 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 605, no 9-10, 875-877 p.Article in journal (Refereed) Published
Abstract [en]

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 UT) 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.

Place, publisher, year, edition, pages
2011. Vol. 605, no 9-10, 875-877 p.
Keyword [en]
Electronic structure, Photoemission, Colossal magnetoresistance
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-153550DOI: 10.1016/j.susc.2011.01.031ISI: 000290050600006OAI: oai:DiVA.org:uu-153550DiVA: diva2:417255
Available from: 2011-05-16 Created: 2011-05-16 Last updated: 2011-05-16Bibliographically approved

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