Publication Date

5-1-2017

DOI

https://doi.org/10.1103/PhysRevB.95.184404

Journal Title

Physical Review B

Volume Number

95

Issue Number

18

First Page

184404

Abstract

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 59CoNMR 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 clattice parameter. Thus 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.

DOE Contract Number(s)

DE-AC02-07CH11358

Share

COinS