Document Type

Article

Publication Version

Published Version

Publication Date

10-19-2012

Journal or Book Title

Physical Review Letters

Volume

109

Issue

16

First Page

167003

DOI

10.1103/PhysRevLett.109.167003

Abstract

The spin fluctuation spectra from nonsuperconducting Cu-substituted, and superconducting Co-substituted, BaFe2As2 are compared quantitatively by inelastic neutron scattering measurements and are found to be indistinguishable. Whereas diffraction studies show the appearance of incommensurate spin-density wave order in Co and Ni substituted samples, the magnetic phase diagram for Cu substitution does not display incommensurate order, demonstrating that simple electron counting based on rigid-band concepts is invalid. These results, supported by theoretical calculations, suggest that substitutional impurity effects in the Fe plane play a significant role in controlling magnetism and the appearance of superconductivity, with Cu distinguished by enhanced impurity scattering and split-band behavior.

Comments

This article is from Phys. Rev. Lett. 109, 16703 (2012), doi:10.1103/PhysRevLett.109.167003. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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