Author:
Kawashima Tsuyoshi,Miyasaka Shigeki,Tsuji Hirokazu,Yamamoto Takahiro,Uekubo Masahiro,Takemori Akira,Lai Kwing To,Tajima Setsuko
Abstract
AbstractThe 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.
Publisher
Springer Science and Business Media LLC
Cited by
9 articles.
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