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1111体系相图揭示铁基超导体中[公式：见文本]轨道和电子关联的重要性。

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

作者信息

Kawashima Tsuyoshi, Miyasaka Shigeki, Tsuji Hirokazu, Yamamoto Takahiro, Uekubo Masahiro, Takemori Akira, Lai Kwing To, Tajima Setsuko

机构信息

Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043 Japan.

Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China.

出版信息

Sci Rep. 2021 May 11;11(1):10006. doi: 10.1038/s41598-021-89231-2.

DOI:10.1038/s41598-021-89231-2
PMID:33976326
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8113352/
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 [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.

摘要

LaFeAsO中三个取代位点的结构灵活性使得能够在广泛的晶体组成范围内研究超导性与结构参数之间的关系。进行了用Nd取代La、用Sb或P取代As以及用F或H取代O的操作。所有这些取代都会改变局部结构参数，而F/H取代还会改变能带填充。研究发现，超导转变温度[公式：见原文]受到来自Fe平面的氮族元素高度[公式：见原文]的强烈影响，该高度控制着电子关联强度和[公式：见原文]空穴费米面（FS）的大小。随着[公式：见原文]的增加，弱耦合BCS超导转变为强耦合非BCS超导，其中电子关联和[公式：见原文]空穴FS可能起重要作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/1132fc97cb26/41598_2021_89231_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/b18d15cc2e33/41598_2021_89231_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/d165a7d86c1a/41598_2021_89231_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/1d5a9b2b468a/41598_2021_89231_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/ec26c1ebb32e/41598_2021_89231_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/3354aa7385c7/41598_2021_89231_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/1132fc97cb26/41598_2021_89231_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/b18d15cc2e33/41598_2021_89231_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/d165a7d86c1a/41598_2021_89231_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/1d5a9b2b468a/41598_2021_89231_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/ec26c1ebb32e/41598_2021_89231_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/3354aa7385c7/41598_2021_89231_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ac1f/8113352/1132fc97cb26/41598_2021_89231_Fig6_HTML.jpg

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本文引用的文献

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Observation of universal strong orbital-dependent correlation effects in iron chalcogenides.铁硫族化合物中普遍存在的强轨道依赖关联效应的观测。
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