Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

12-23-2011

Journal or Book Title

Physical Review Letters

Volume

107

Issue

26

First Page

267002

DOI

10.1103/PhysRevLett.107.267002

Abstract

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.

Comments

This article is published as Dhaka, R. S., Chang Liu, Rafael M. Fernandes, Rui Jiang, C. P. Strehlow, Takeshi Kondo, A. Thaler et al. "What Controls the Phase Diagram and Superconductivity in Ru-Substituted BaFe 2 As 2?." Physical Review Letters 107, no. 26 (2011): 267002. DOI: 10.1103/PhysRevLett.107.267002. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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