Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system
Abstract 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 subst...
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Nature Portfolio
2021
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oai:doaj.org-article:42b4174756a74cff906216c67e52a39d2021-12-02T17:01:49ZImportance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system10.1038/s41598-021-89231-22045-2322https://doaj.org/article/42b4174756a74cff906216c67e52a39d2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89231-2https://doaj.org/toc/2045-2322Abstract 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 $$T_{\text{c}}$$ T c is strongly affected by the pnictogen height $$h_{Pn}$$ h Pn from the Fe-plane that controls the electron correlation strength and the size of the $$d_{xy}$$ d xy hole Fermi surface (FS). With increasing $$h_{Pn}$$ h Pn , weak coupling BCS superconductivity switches to the strong coupling non-BCS one where electron correlations and the $$d_{xy}$$ d xy hole FS may be important.Tsuyoshi KawashimaShigeki MiyasakaHirokazu TsujiTakahiro YamamotoMasahiro UekuboAkira TakemoriKwing To LaiSetsuko TajimaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021) |
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Medicine R Science Q Tsuyoshi Kawashima Shigeki Miyasaka Hirokazu Tsuji Takahiro Yamamoto Masahiro Uekubo Akira Takemori Kwing To Lai Setsuko Tajima Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| description |
Abstract 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 $$T_{\text{c}}$$ T c is strongly affected by the pnictogen height $$h_{Pn}$$ h Pn from the Fe-plane that controls the electron correlation strength and the size of the $$d_{xy}$$ d xy hole Fermi surface (FS). With increasing $$h_{Pn}$$ h Pn , weak coupling BCS superconductivity switches to the strong coupling non-BCS one where electron correlations and the $$d_{xy}$$ d xy hole FS may be important. |
| format |
article |
| author |
Tsuyoshi Kawashima Shigeki Miyasaka Hirokazu Tsuji Takahiro Yamamoto Masahiro Uekubo Akira Takemori Kwing To Lai Setsuko Tajima |
| author_facet |
Tsuyoshi Kawashima Shigeki Miyasaka Hirokazu Tsuji Takahiro Yamamoto Masahiro Uekubo Akira Takemori Kwing To Lai Setsuko Tajima |
| author_sort |
Tsuyoshi Kawashima |
| title |
Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| title_short |
Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| title_full |
Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| title_fullStr |
Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| title_full_unstemmed |
Importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| title_sort |
importance of $${{d}}_{{{xy}}}$$ d xy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system |
| publisher |
Nature Portfolio |
| publishDate |
2021 |
| url |
https://doaj.org/article/42b4174756a74cff906216c67e52a39d |
| work_keys_str_mv |
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1718382023820705792 |