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Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr(0.5)Sr(0.5)MnO(3)

P. Pal ; M. K. Dalai ; B. R. Sekhar ; Intikhab Ulfat (Institutionen för teknisk fysik, Fasta tillståndets fysik) ; M. Merz ; P. Nagel ; S. Schuppler
Physica B-Condensed Matter (0921-4526). Vol. 406 (2011), 18, p. 3519-3523.
[Artikel, refereegranskad vetenskaplig]

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. (C) 2011 Elsevier B.V. All rights reserved.

Nyckelord: Photoemission spectroscopy, CMR, Insulator-metal transitions, colossal magnetoresistance, double-exchange, pr1-xsrxmno3, perovskites, charge

Denna post skapades 2011-09-01.
CPL Pubid: 145683


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Institutionen för teknisk fysik, Fasta tillståndets fysik (2005-2015)



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