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Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr(0.5)Sr(0.5)MnO(3)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2011 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 406, no 18, 3519-3523 p.Article in journal (Refereed) Published
Abstract [en]

The valence band electronic structure of Pr(0.5)Sr(0.5)MnO(3) has been investigated using resonant photoemission spectroscopies across its paramagnetic metallic (PMM)-ferromagnetic metallic (FMM)-antiferromagnetic insulator (AFMI) transition. Using bulk sensitive soft X-ray photoemission, we have confirmed the presence of a gap in the near Fermi level electronic spectrum in the charge ordering (CO) antiferromagnetic insulator (AFMI) phase. The Fermi level exhibits a rigid-band-like shift of about similar to 0.4 eV across the PMM to AFMI transition. Further, we have observed a similar shift of the Pr 4f states to higher binding energies when the sample goes to the CO-AFMI state. The spectral behavior indicates a strong charge carrier localization associated with a charge-density-wave gap related to the CO. On the other hand, the growth of spectral weight at the Fermi level in the PMM state could well be connected to the microscopic phase-separation model.

Place, publisher, year, edition, pages
2011. Vol. 406, no 18, 3519-3523 p.
Keyword [en]
Photoemission spectroscopy, CMR, Insulator-metal transitions
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-158147DOI: 10.1016/j.physb.2011.06.042ISI: 000293031300034OAI: oai:DiVA.org:uu-158147DiVA: diva2:438871
Available from: 2011-09-05 Created: 2011-09-01 Last updated: 2011-09-09Bibliographically approved

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