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Title: Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca ( Fe 1 - x Co x ) 2 As 2 revealed by As 75 nuclear magnetic resonance

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 BaFe 2 As 2 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 ( Fe 1 - x Co x ) 2 As 2 . 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 CaFe 2 As 2 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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1342923
Report Number(s):
IS-J 9160
Journal ID: ISSN 2469-9950; PRBMDO
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Cui, J., Wiecki, P., Ran, S., Bud'ko, S. L., Canfield, P. C., and Furukawa, Y. Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by As75 nuclear magnetic resonance. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.174512.
Cui, J., Wiecki, P., Ran, S., Bud'ko, S. L., Canfield, P. C., & Furukawa, Y. Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by As75 nuclear magnetic resonance. United States. doi:10.1103/PhysRevB.94.174512.
Cui, J., Wiecki, P., Ran, S., Bud'ko, S. L., Canfield, P. C., and Furukawa, Y. Tue . "Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by As75 nuclear magnetic resonance". United States. doi:10.1103/PhysRevB.94.174512.
@article{osti_1342923,
title = {Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by As75 nuclear magnetic resonance},
author = {Cui, J. and Wiecki, P. and Ran, S. and Bud'ko, S. L. and Canfield, P. C. and Furukawa, Y.},
abstractNote = {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 BaFe 2 As 2 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 ( Fe 1 - x Co x ) 2 As 2 . 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 CaFe 2 As 2 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.},
doi = {10.1103/PhysRevB.94.174512},
journal = {Physical Review B},
issn = {2469-9950},
number = 17,
volume = 94,
place = {United States},
year = {2016},
month = {11}
}