Spin crossover, structural change, and metallization in NiAs-type FeO at high pressure

Haruka Ozawa, Kei Hirose, Kenji Ohta, Hirofumi Ishii, Nozomu Hiraoka, Yasuo Ohishi, Yusuke Seto

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We report high-spin to low-spin crossover of iron in NiAs (B8)-type Fe 0.96O (FeO hereafter) at high pressure by a combination of in-situ x-ray emission spectroscopy (XES) and x-ray diffraction (XRD) measurements. The XES spectra show a loss of spin in B8-type FeO approximately above 119 GPa at 300 K, consistent with the ∼2.5% volume reduction around 120 GPa. The high-temperature XRD study also demonstrates a similar volume decrease at 1560-1780 K under the same pressure condition. While the crystal structure of FeO remains to be B8 type across such volume reduction, the atomic arrangements of Fe and O change from inverse to normal NiAs form with considerable decrease in c/a axial ratio. With recent electrical resistance measurements, these suggest that iron spin crossover, inverse-normal structural change, and insulator-metal transition occur concurrently in B8 FeO around 120 GPa.

Original languageEnglish
Article number134417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number13
DOIs
Publication statusPublished - Oct 14 2011
Externally publishedYes

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Metallizing
crossovers
X rays
Emission spectroscopy
x ray diffraction
Iron
Diffraction
iron
Metal insulator transition
Acoustic impedance
electrical resistance
spectroscopy
x rays
Crystal structure
transition metals
insulators
crystal structure
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Spin crossover, structural change, and metallization in NiAs-type FeO at high pressure. / Ozawa, Haruka; Hirose, Kei; Ohta, Kenji; Ishii, Hirofumi; Hiraoka, Nozomu; Ohishi, Yasuo; Seto, Yusuke.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 13, 134417, 14.10.2011.

Research output: Contribution to journalArticle

Ozawa, Haruka ; Hirose, Kei ; Ohta, Kenji ; Ishii, Hirofumi ; Hiraoka, Nozomu ; Ohishi, Yasuo ; Seto, Yusuke. / Spin crossover, structural change, and metallization in NiAs-type FeO at high pressure. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 84, No. 13.
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AU - Ozawa, Haruka

AU - Hirose, Kei

AU - Ohta, Kenji

AU - Ishii, Hirofumi

AU - Hiraoka, Nozomu

AU - Ohishi, Yasuo

AU - Seto, Yusuke

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