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

doi:10.1143/JPSJ.77.094715

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 journal › Article › peer-review

29 Citations (Scopus)

Abstract

Heat capacity measurement was performed on recently discovered, iron-based layered superconductors, namely, nondoped LaFePO and fluorine-doped LaFePO (LaFePO_0.94F_0.06). A relatively large electronic heat capacity coefficient (γ) of 10.6 mJ K^-2 mol^-1 and a small normalized heat capacity jump (ΔC_p/γT_c) of 0.29 at T_c = 3.3K were observed in LaFePO. LaFePO _0.94F_0.06 had a smaller γ of 8.3 mJ K^-2 mol^-1 and a larger ΔC_p/γT_c of 0.44 at T_c = 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 language	English
Article number	094715
Journal	Journal of the Physical Society of Japan
Volume	77
Issue number	9
DOIs	https://doi.org/10.1143/JPSJ.77.094715
Publication status	Published - 2008 Sept
Externally published	Yes

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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10.1143/JPSJ.77.094715

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title = "Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity",

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.",

keywords = "Heat capacity, Iron-based layered superconductor, LaFePO, Magnetic spin fluctuation, Superconductivity, Unconventional superconductivity",

author = "Yoshimitsu Kohama and Yoichi Kamihara and Hitoshi Kawaji and Tooru Atake and Masahiro Hirano and Hideo Hosono",

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T2 - Study of heat capacity

AU - Kohama, Yoshimitsu

AU - Kamihara, Yoichi

AU - Kawaji, Hitoshi

AU - Atake, Tooru

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2008/9

Y1 - 2008/9

N2 - 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.

AB - 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.

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KW - Magnetic spin fluctuation

KW - Superconductivity

KW - Unconventional superconductivity

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

Abstract

Keywords

ASJC Scopus subject areas

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