High-Pressure <SUP>57</SUP>Fe Mössbauer Spectroscopy of LaFeAsO

• Kawakami Takateru

  Institute of Quantum Science, Nihon University

• Kamatani Takanori

  Graduate School of Science and Technology, Nihon University

• Okada Hironari

  Department of Physics, College of Humanities and Sciences, Nihon University JST, Transformative Research-Project on Iron Pnictides (TRIP)

• Takahashi Hiroki

  Department of Physics, College of Humanities and Sciences, Nihon University JST, Transformative Research-Project on Iron Pnictides (TRIP)

• Nasu Saburo

  Institute for Chemical Research, Kyoto University

• Kamihara Yoichi

  ERATO-SORST, JST, Frontier Research Center, Tokyo Institute of Technology

• Hirano Masahiro

  ERATO-SORST, JST, Frontier Research Center, Tokyo Institute of Technology Frontier Research Center, Tokyo Institute of Technology

• Hosono Hideo

  ERATO-SORST, JST, Frontier Research Center, Tokyo Institute of Technology Frontier Research Center, Tokyo Institute of Technology

Bibliographic Information

Other Title

• High-pressure 57Fe Mossbauer spectroscopy of LaFeAsO

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 35 GPa, respectively. The Néel temperature gradually decreased from ∼140 K 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.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 78 (12), 123703-123703, 2009

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• LaFeAsO
• high pressure
• <SUP>57</SUP>Fe Mössbauer spectroscopy
• electrical resistance
• superconductivity
• magnetism

Details

• CRID: 1390001204196862336
• NII Article ID: 130005437250
• NII Article ID: 40016879630
• NII Article ID: 210000108103
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.78.123703
• BIBCODE: 2009JPSJ...78l3703K
• ISSN: 13474073
• ISSN: 00319015
• ISSN: http://id.crossref.org/issn/00319015
• NDL BIB ID: 10479937
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10479937
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.123703
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed