Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity

Yoshimitsu Kohama, Yoichi Kamihara, Hitoshi Kawaji, Tooru Atake, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Heat capacity measurement was performed on recently discovered, iron-based layered superconductors, namely, nondoped LaFePO and fluorine-doped LaFePO (LaFePO0.94F0.06). A relatively large electronic heat capacity coefficient (γ) of 10.6 mJ K-2 mol-1 and a small normalized heat capacity jump (ΔCp/γTc) of 0.29 at Tc = 3.3K were observed in LaFePO. LaFePO 0.94F0.06 had a smaller γ of 8.3 mJ K-2 mol-1 and a larger ΔCp/γTc of 0.44 at Tc = 5.8 K. These results indicate that these compounds have a strong electron-electron correlation and a large magnetic spin fluctuation, which are the signatures of unconventional superconductivity mediated by spin fluctuation.

Original languageEnglish
Article number094715
JournalJournal of the Physical Society of Japan
Volume77
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1
Externally publishedYes

Keywords

  • Heat capacity
  • Iron-based layered superconductor
  • LaFePO
  • Magnetic spin fluctuation
  • Superconductivity
  • Unconventional superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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