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Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3

Pal, Prabir LU ; Dalai, M. K.; Sekhar, B. R.; Ulfat, Intikhab LU ; Merz, M.; Nagel, P. and Schuppler, S. (2011) In Physica B: Condensed Matter 406(18). p.3519-3523
Abstract
The valence band electronic structure of Pr0.5Sr0.5MnO3 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... (More)
The valence band electronic structure of Pr0.5Sr0.5MnO3 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. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Photoemission spectroscopy, CMR, Insulator-metal transitions
in
Physica B: Condensed Matter
volume
406
issue
18
pages
3519 - 3523
publisher
Elsevier
external identifiers
  • wos:000293031300034
  • scopus:79960182498
ISSN
0921-4526
DOI
10.1016/j.physb.2011.06.042
language
English
LU publication?
yes
id
dd3964f5-811c-447b-8e46-a31ad70a621f (old id 2162786)
date added to LUP
2011-09-20 12:25:31
date last changed
2017-01-01 05:37:22
@article{dd3964f5-811c-447b-8e46-a31ad70a621f,
  abstract     = {The valence band electronic structure of Pr0.5Sr0.5MnO3 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.},
  author       = {Pal, Prabir and Dalai, M. K. and Sekhar, B. R. and Ulfat, Intikhab and Merz, M. and Nagel, P. and Schuppler, S.},
  issn         = {0921-4526},
  keyword      = {Photoemission spectroscopy,CMR,Insulator-metal transitions},
  language     = {eng},
  number       = {18},
  pages        = {3519--3523},
  publisher    = {Elsevier},
  series       = {Physica B: Condensed Matter},
  title        = {Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3},
  url          = {http://dx.doi.org/10.1016/j.physb.2011.06.042},
  volume       = {406},
  year         = {2011},
}