High-pressure 57Fe Mössbauer spectroscopy of LaFeAsO

Takateru Kawakami, Takanori Kamatani, Hironari Okada, Hiroki Takahashi, Saburo Nasu, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

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17 Citations (Scopus)

Abstract

The electronic properties of an oxypnictide, LaFeAsO, pressurized in a diamond-anvil cell, were investigated by 57Fe Mössbauer spectroscopy and electrical resistance measurements at pressures up to 24 and 35GPa, respectively. The Néel temperature gradually decreased from ∼140K at 0.1 MPa to ∼50 K at 20 GPa, and fell below 8 K or disappeared at 24 GPa. The hyperfine field at 8 K decreased from 5.3 T at 0.1 MPa to 2.2 T at 20 GPa. On the other hand, the onset of superconductivity occurred at ∼9 K at 2 GPa. The superconductivity peaked at ∼21 K at 12 GPa, and then began a perceptible decline, disappearing at ∼35 GPa. This suggests that suppression of antiferromagnetic order plays an important role in the emergence of pressure-induced superconductivity.

Original languageEnglish
Article number123703
JournalJournal of the Physical Society of Japan
Volume78
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1
Externally publishedYes

Keywords

  • Electrical resistance
  • Fe Mössbauer spectroscopy
  • High pressure
  • LaFeAsO
  • Magnetism
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kawakami, T., Kamatani, T., Okada, H., Takahashi, H., Nasu, S., Kamihara, Y., Hirano, M., & Hosono, H. (2009). High-pressure 57Fe Mössbauer spectroscopy of LaFeAsO. Journal of the Physical Society of Japan, 78(12), [123703]. https://doi.org/10.1143/JPSJ.78.123703