What Controls the Phase Diagram and Superconductivity in Ru-Substituted BaFe2As2?

被引：63

作者：

Dhaka, R. S. ^{[1
]}

Liu, Chang

Fernandes, R. M.

Jiang, Rui

Strehlow, C. P.

Kondo, Takeshi

Thaler, A.

Schmalian, Joerg

Bud'ko, S. L.

Canfield, P. C.

Kaminski, Adam

机构：

[1] US DOE, Ames Lab, Div Engn & Mat Sci, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 26期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.107.267002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use high resolution angle-resolved photoemission to study the electronic structure of the iron based high-temperature superconductors Ba(Fe1-xRux)(2)As-2 as a function of Ru concentration. We find that substitution of Ru for Fe is isoelectronic, i.e., it does not change the value of the chemical potential. More interestingly, there are no measured, significant changes in the shape of the Fermi surface or in the Fermi velocity over a wide range of substitution levels (0 < x < 0.55). Given that the suppression of the antiferromagnetic and structural phase is associated with the emergence of the superconducting state, Ru substitution must achieve this via a mechanism that does not involve changes of the Fermi surface. We speculate that this mechanism relies on magnetic dilution which leads to the reduction of the effective Stoner enhancement.

引用

页数：5

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