Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

11-1-2016

Journal or Book Title

Physical Review B

Volume

94

Issue

17

First Page

174512

DOI

10.1103/PhysRevB.94.174512

Abstract

Recent nuclear magnetic resonance (NMR) measurements revealed the coexistence of stripe-type antiferromagnetic (AFM) and ferromagnetic (FM) spin correlations in both the hole- and electron-doped BaFe2As2 families of iron-pnictide superconductors by a Korringa ratio analysis. Motivated by the NMR work, we investigate the possible existence of FM fluctuations in another iron-pnictide superconducting family, Ca(Fe1−xCox)2As2. We reanalyzed our previously reported data in terms of the Korringa ratio and found clear evidence for the coexistence of stripe-type AFM and FM spin correlations in the electron-doped CaFe2As2 system. These NMR data indicate that FM fluctuations exist in general in iron-pnictide superconducting families and thus must be included to capture the phenomenology of the iron pnictides.

Comments

This article is published as Cui, J., P. Wiecki, S. Ran, S. L. Bud'ko, P. C. Canfield, and Y. Furukawa. "Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca (Fe 1− x Co x) 2 As 2 revealed by As 75 nuclear magnetic resonance." Physical Review B 94, no. 17 (2016): 174512. DOI: 10.1103/PhysRevB.94.174512. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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