Momentum densities, Fermi surfaces, and their temperature dependences in Sr2 RuO4 studied by Compton scattering

N. Hiraoka, T. Buslaps, V. Honkimäki, T. Nomura, M. Itou, Y. Sakurai, Zhiqiang Mao, Y. Maeno

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have measured Compton profiles of Sr2 RuO4 at 20 K and room temperature to investigate electron momentum densities, Fermi surfaces, and their temperature dependences. Two-dimensional momentum densities have been reconstructed from nine Compton profiles. The Fermi surface signals are observed in the first derivative of the occupation densities in k space, obtained by folding the momentum densities into the first Brillouin zone. The data at T=20 K exhibit Fermi surface signals that reasonably agree with those obtained from band theory. On the other hand, the data at room temperature show the signals strongly suppressed due to temperature. This thermal behavior is not understood using band theory based on the local density approximation, implying the importance of electron correlation in the temperature effect.

Original languageEnglish (US)
Article number100501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number10
DOIs
StatePublished - Sep 13 2006

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Compton scattering
Fermi surface
Fermi surfaces
Momentum
momentum
temperature dependence
scattering
Electron correlations
Local density approximation
Temperature
Thermal effects
room temperature
profiles
Brillouin zones
occupation
folding
temperature effects
Derivatives
electrons
Electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hiraoka, N. ; Buslaps, T. ; Honkimäki, V. ; Nomura, T. ; Itou, M. ; Sakurai, Y. ; Mao, Zhiqiang ; Maeno, Y. / Momentum densities, Fermi surfaces, and their temperature dependences in Sr2 RuO4 studied by Compton scattering. In: Physical Review B - Condensed Matter and Materials Physics. 2006 ; Vol. 74, No. 10.
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abstract = "We have measured Compton profiles of Sr2 RuO4 at 20 K and room temperature to investigate electron momentum densities, Fermi surfaces, and their temperature dependences. Two-dimensional momentum densities have been reconstructed from nine Compton profiles. The Fermi surface signals are observed in the first derivative of the occupation densities in k space, obtained by folding the momentum densities into the first Brillouin zone. The data at T=20 K exhibit Fermi surface signals that reasonably agree with those obtained from band theory. On the other hand, the data at room temperature show the signals strongly suppressed due to temperature. This thermal behavior is not understood using band theory based on the local density approximation, implying the importance of electron correlation in the temperature effect.",
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Momentum densities, Fermi surfaces, and their temperature dependences in Sr2 RuO4 studied by Compton scattering. / Hiraoka, N.; Buslaps, T.; Honkimäki, V.; Nomura, T.; Itou, M.; Sakurai, Y.; Mao, Zhiqiang; Maeno, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 74, No. 10, 100501, 13.09.2006.

Research output: Contribution to journalArticle

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T1 - Momentum densities, Fermi surfaces, and their temperature dependences in Sr2 RuO4 studied by Compton scattering

AU - Hiraoka, N.

AU - Buslaps, T.

AU - Honkimäki, V.

AU - Nomura, T.

AU - Itou, M.

AU - Sakurai, Y.

AU - Mao, Zhiqiang

AU - Maeno, Y.

PY - 2006/9/13

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AB - We have measured Compton profiles of Sr2 RuO4 at 20 K and room temperature to investigate electron momentum densities, Fermi surfaces, and their temperature dependences. Two-dimensional momentum densities have been reconstructed from nine Compton profiles. The Fermi surface signals are observed in the first derivative of the occupation densities in k space, obtained by folding the momentum densities into the first Brillouin zone. The data at T=20 K exhibit Fermi surface signals that reasonably agree with those obtained from band theory. On the other hand, the data at room temperature show the signals strongly suppressed due to temperature. This thermal behavior is not understood using band theory based on the local density approximation, implying the importance of electron correlation in the temperature effect.

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