Precise Pressure Dependence of the Superconducting Transition Temperature of FeSe: Resistivity and <SUP>77</SUP>Se-NMR Study

• Masaki Satoru

  Department of Physics, Kobe University

• Kotegawa Hisashi

  Department of Physics, Kobe University JST, Transformative Research-Project on Iron Pnictides (TRIP)

• Hara Yudai

  Department of Physics, Kobe University

• Tou Hideki

  Department of Physics, Kobe University JST, Transformative Research-Project on Iron Pnictides (TRIP)

• Murata Keizo

  Division of Molecular Materials Science, Graduate School of Science, Osaka City University

• Mizuguchi Yoshikazu

  National Institute for Materials Science University of Tsukuba JST, Transformative Research-Project on Iron Pnictides (TRIP)

• Takano Yoshihiko

  National Institute for Materials Science University of Tsukuba JST, Transformative Research-Project on Iron Pnictides (TRIP)

Bibliographic Information

Other Title

• Precise pressure dependence of the superconducting transition temperature of FeSe: resistivity and 77Se-NMR study

Abstract

We report the precise pressure dependence of FeSe from a resistivity measurement up to 4.15 GPa. Superconducting transition temperature (T_c) increases sensitively under pressure, but shows a plateau between 0.5–1.5 GPa. The maximum T_c, which is determined by zero resistance, is 21 K at approximately 3.5 GPa. The onset value reaches ∼37 K at 4.15 GPa. We also measure the nuclear spin–lattice relaxation rate 1⁄T₁ under pressure using ⁷⁷Se-NMR measurement. 1⁄T₁ shows that bulk superconductivity is realized in the zero-resistance state. The pressure dependence of 1⁄T₁T just above T_c shows a plateau as well as the pressure dependence of T_c, which gives clear evidence of the close relationship between 1⁄T₁T and T_c. Spin fluctuations are suggested to contribute to the mechanism of superconductivity.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 78 (6), 063704-063704, 2009

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• FeSe
• superconductivity
• pressure

Details

• CRID: 1390282679173164544
• NII Article ID: 130005437409
• NII Article ID: 10025960877
• NII Article ID: 210000107821
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.78.063704
• ISSN: 13474073
• ISSN: 00319015
• ISSN: http://id.crossref.org/issn/00319015
• NDL BIB ID: 10252109
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10252109
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.063704
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed