Electronic structure of La2-2xSr1+2xMn 2O7 studied by x-ray photoemission spectroscopy

J. Y. Son, Takashi Mizokawa, J. W. Quilty, S. Hirata, K. Takubo, T. Kimura, Y. Tokura

Research output: Contribution to journalArticle

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Abstract

We have studied the electronic structure of La2-2xS 1+2xMn2O7 with x=0.4 and 0.5 by means of x-ray photoemission spectroscopy (XPS). In going from x=0.4 to x=0.5, the O 1s, Mn 2p, and valence-band spectra show an energy shift of ∼0.2 eV toward the Fermi level that is consistent with the hole doping in the eg band. The spectral weight at the Fermi level is considerably suppressed for x=0.4 and 0.5, indicating that the eg electron has polaronic character as pointed out by Dessau et al. Also, photoemission measurements have been done for the samples illuminated with laser light to probe photoinduced change of the electronic structure. While the O 1s spectrum of the x=0.4 sample is shifted by 0.1 eV to the higher binding energy side, that of x=0.5 is shifted by 0.7 eV. This would be related to the phase competition between the CE-type and A-type antiferromagnetic states and the unusual electron-lattice coupling found in x=0.5.

Original languageEnglish
Article number012411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number1
DOIs
Publication statusPublished - 2004 Jul
Externally publishedYes

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Photoelectron spectroscopy
Fermi level
Electronic structure
photoelectric emission
electronic structure
X rays
Electrons
Photoemission
Valence bands
Binding energy
spectroscopy
electrons
x rays
binding energy
Doping (additives)
valence
Lasers
probes
shift
lasers

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic structure of La2-2xSr1+2xMn 2O7 studied by x-ray photoemission spectroscopy. / Son, J. Y.; Mizokawa, Takashi; Quilty, J. W.; Hirata, S.; Takubo, K.; Kimura, T.; Tokura, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 1, 012411, 07.2004.

Research output: Contribution to journalArticle

Son, J. Y. ; Mizokawa, Takashi ; Quilty, J. W. ; Hirata, S. ; Takubo, K. ; Kimura, T. ; Tokura, Y. / Electronic structure of La2-2xSr1+2xMn 2O7 studied by x-ray photoemission spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2004 ; Vol. 70, No. 1.
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