NMR determination of an incommensurate helical antiferromagnetic structure in EuCo2As2

Ding, Q. -P.; Higa, N.; Sangeetha, N. S.; Johnston, D. C.; Furukawa, Y.

doi:10.1103/PhysRevB.95.184404

NMR determination of an incommensurate helical antiferromagnetic structure in ${EuCo}_{2} {As}_{2}$

Journal Article · Fri May 05 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.184404· OSTI ID:1362276

Ding, Q. -P. ^[1]; Higa, N. ^[2]; Sangeetha, N. S. ^[1]; Johnston, D. C. ^[1]; Furukawa, Y. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
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

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 T_N = 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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of the Ryukyus, Nishihara (Japan)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (Japan)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1362276

Alternate ID(s):: OSTI ID: 1355957

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 95; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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