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Title: NMR determination of an incommensurate helical antiferromagnetic structure in EuCo 2 As 2

Abstract

In this paper, we report 153Eu, 75As, and 59Co nuclear magnetic resonance (NMR) results on EuCo 2As 2 single crystal. Observations of 153Eu and 75As NMR spectra in zero magnetic field at 4.3 K below an antiferromagnetic (AFM) ordering temperature T N = 45 K and its external magnetic field dependence clearly evidence an incommensurate helical AFM structure in EuCo 2As 2. Furthermore, based on 59Co NMR data in both the paramagnetic and the incommensurate AFM states, we have determined the model-independent value of the AFM propagation vector k = (0,0,0.73 ± 0.07)2π/c, where c is the c lattice parameter. Finally, the incommensurate helical AFM state was characterized by only NMR data with model-independent analyses, showing NMR to be a unique tool for determination of the spin structure in incommensurate helical AFMs.

Authors:
 [1];  [2];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Univ. of the Ryukyus, Nishihara (Japan). Dept. of Physics and Earth Sciences
Publication Date:
Research Org.:
Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of the Ryukyus, Nishihara (Japan)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (Japan)
OSTI Identifier:
1362276
Alternate Identifier(s):
OSTI ID: 1355957
Grant/Contract Number:
AC02-07CH11358; JP15K21732; JP15H05885; JP16H01078
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 18; 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; antiferromagnetism; magnetism; pnictides; nuclear magnetic resonance; condensed matter and materials physics

Citation Formats

Ding, Q. -P., Higa, N., Sangeetha, N. S., Johnston, D. C., and Furukawa, Y. NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.184404.
Ding, Q. -P., Higa, N., Sangeetha, N. S., Johnston, D. C., & Furukawa, Y. NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2. United States. doi:10.1103/PhysRevB.95.184404.
Ding, Q. -P., Higa, N., Sangeetha, N. S., Johnston, D. C., and Furukawa, Y. Fri . "NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2". United States. doi:10.1103/PhysRevB.95.184404. https://www.osti.gov/servlets/purl/1362276.
@article{osti_1362276,
title = {NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2},
author = {Ding, Q. -P. and Higa, N. and Sangeetha, N. S. and Johnston, D. C. and Furukawa, Y.},
abstractNote = {In this paper, we report 153Eu, 75As, and 59Co nuclear magnetic resonance (NMR) results on EuCo2As2 single crystal. Observations of 153Eu and 75As NMR spectra in zero magnetic field at 4.3 K below an antiferromagnetic (AFM) ordering temperature TN = 45 K and its external magnetic field dependence clearly evidence an incommensurate helical AFM structure in EuCo2As2. Furthermore, based on 59Co NMR data in both the paramagnetic and the incommensurate AFM states, we have determined the model-independent value of the AFM propagation vector k = (0,0,0.73 ± 0.07)2π/c, where c is the c lattice parameter. Finally, the incommensurate helical AFM state was characterized by only NMR data with model-independent analyses, showing NMR to be a unique tool for determination of the spin structure in incommensurate helical AFMs.},
doi = {10.1103/PhysRevB.95.184404},
journal = {Physical Review B},
number = 18,
volume = 95,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2017},
month = {Fri May 05 00:00:00 EDT 2017}
}

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