Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

9-25-2015

Journal or Book Title

Physical Review Letters

Volume

115

Issue

3

First Page

137001

DOI

10.1103/PhysRevLett.115.137001

Abstract

In the iron pnictide superconductors, theoretical calculations have consistently shown enhancements of the static magnetic susceptibility at both the stripe-type antiferromagnetic and in-plane ferromagnetic (FM) wave vectors. However, the possible existence of FM fluctuations has not yet been examined from a microscopic point of view. Here, using 75As NMR data, we provide clear evidence for the existence of FM spin correlations in both the hole- and electron-doped BaFe2As2 families of iron-pnictide superconductors. These FM fluctuations appear to compete with superconductivity and are thus a crucial ingredient to understanding the variability of Tc and the shape of the superconducting dome in these and other iron-pnictide families.

Comments

This article is published as Wiecki, P., B. Roy, D. C. Johnston, S. L. Bud’ko, P. C. Canfield, and Y. Furukawa. "Competing magnetic fluctuations in iron pnictide superconductors: role of ferromagnetic spin correlations revealed by NMR." Physical Review Letters 115, no. 13 (2015): 137001. DOI: 10.1103/PhysRevLett.115.137001. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Included in

Physics Commons

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