Importance of [Formula: see text] orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system

Importance of [Formula: see text] orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system

The structural flexibility at three substitution sites in LaFeAsO enabled investigation of the relation between superconductivity and structural parameters over a wide range of crystal compositions. Substitutions of Nd for La, Sb or P for As, and F or H for O were performed. All these substitutions...

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Veröffentlicht in:Scientific reports 2021-05, Vol.11 (1), p.10006-10006, Article 10006
Hauptverfasser: Kawashima, Tsuyoshi, Miyasaka, Shigeki, Tsuji, Hirokazu, Yamamoto, Takahiro, Uekubo, Masahiro, Takemori, Akira, Lai, Kwing To, Tajima, Setsuko
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container_end_page 10006
container_issue 1
container_start_page 10006
container_title Scientific reports
container_volume 11
creator Kawashima, Tsuyoshi
Miyasaka, Shigeki
Tsuji, Hirokazu
Yamamoto, Takahiro
Uekubo, Masahiro
Takemori, Akira
Lai, Kwing To
Tajima, Setsuko
description The structural flexibility at three substitution sites in LaFeAsO enabled investigation of the relation between superconductivity and structural parameters over a wide range of crystal compositions. Substitutions of Nd for La, Sb or P for As, and F or H for O were performed. All these substitutions modify the local structural parameters, while the F/H-substitution also changes band filling. It was found that the superconducting transition temperature [Formula: see text] is strongly affected by the pnictogen height [Formula: see text] from the Fe-plane that controls the electron correlation strength and the size of the [Formula: see text] hole Fermi surface (FS). With increasing [Formula: see text], weak coupling BCS superconductivity switches to the strong coupling non-BCS one where electron correlations and the [Formula: see text] hole FS may be important.
doi_str_mv 10.1038/s41598-021-89231-2
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title Importance of [Formula: see text] orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system
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