Systematic change of spectral function observed by controlling electron correlation in Ca1-xSrxVO3 with fixed 3d1 configuration.

I. H. Inoue, I. Hase, Y. Aiura, A. Fujimori, K. Morikawa, Takashi Mizokawa, Y. Haruyama, T. Maruyama, Y. Nishihara

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Abstract

By using ultra-violet photoemission spectroscopy (UPS) and soft x-ray absorption spectroscopy (XAS), we have observed a systematic change of the spectral function around the Fermi level in the perovskite-type conductive 3d1 system, Ca1-xSrxVO3. When we decrease the Sr concentration (x) from 1 to 0 in Ca1-xSrxVO3, UPS and XAS intensities near the Fermi level decrease, and the reduced spectral weight is transferred to high energy part about 2 eV below and above Fermi level. The high energy features are thought to correspond to the remnants of lower and upper Hubbard bands, and the spectral weight within ∼1eV of Fermi level is assigned to the quasiparticle excitations or renormalized 3d-band. That is, the observed systematic spectral change indicates the opening of Mott-Hubbard gap.

Original languageEnglish
Pages (from-to)1007-1008
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume235-240
Issue numberPART 2
DOIs
Publication statusPublished - 1994
Externally publishedYes

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Electron correlations
Fermi level
Photoelectron spectroscopy
configurations
Ultraviolet spectroscopy
Absorption spectroscopy
x ray absorption
x ray spectroscopy
absorption spectroscopy
electrons
photoelectric emission
X rays
Perovskite
spectroscopy
energy
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

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Systematic change of spectral function observed by controlling electron correlation in Ca1-xSrxVO3 with fixed 3d1 configuration. / Inoue, I. H.; Hase, I.; Aiura, Y.; Fujimori, A.; Morikawa, K.; Mizokawa, Takashi; Haruyama, Y.; Maruyama, T.; Nishihara, Y.

In: Physica C: Superconductivity and its Applications, Vol. 235-240, No. PART 2, 1994, p. 1007-1008.

Research output: Contribution to journalArticle

Inoue, I. H. ; Hase, I. ; Aiura, Y. ; Fujimori, A. ; Morikawa, K. ; Mizokawa, Takashi ; Haruyama, Y. ; Maruyama, T. ; Nishihara, Y. / Systematic change of spectral function observed by controlling electron correlation in Ca1-xSrxVO3 with fixed 3d1 configuration. In: Physica C: Superconductivity and its Applications. 1994 ; Vol. 235-240, No. PART 2. pp. 1007-1008.
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AU - Inoue, I. H.

AU - Hase, I.

AU - Aiura, Y.

AU - Fujimori, A.

AU - Morikawa, K.

AU - Mizokawa, Takashi

AU - Haruyama, Y.

AU - Maruyama, T.

AU - Nishihara, Y.

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AB - By using ultra-violet photoemission spectroscopy (UPS) and soft x-ray absorption spectroscopy (XAS), we have observed a systematic change of the spectral function around the Fermi level in the perovskite-type conductive 3d1 system, Ca1-xSrxVO3. When we decrease the Sr concentration (x) from 1 to 0 in Ca1-xSrxVO3, UPS and XAS intensities near the Fermi level decrease, and the reduced spectral weight is transferred to high energy part about 2 eV below and above Fermi level. The high energy features are thought to correspond to the remnants of lower and upper Hubbard bands, and the spectral weight within ∼1eV of Fermi level is assigned to the quasiparticle excitations or renormalized 3d-band. That is, the observed systematic spectral change indicates the opening of Mott-Hubbard gap.

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