NMR studies of the incommensurate helical antiferromagnet EuCo2P2 : determination of the antiferromagnetic propagation vector

Abstract

Recently Ding et al. [Phys. Rev. B 95, 184404 (2017)] reported that their nuclear magnetic resonance (NMR) study on EuCo${}_2$As${}_2$ successfully characterized the antiferromagnetic (AFM) propagation vector of the incommensurate helix AFM state, showing that NMR is a unique tool for determination of the spin structures in incommensurate helical AFMs. Motivated by this work, we have carried out ${}^{153}$Eu, ${}^{31}$P and ${}^{59}$Co NMR measurements on the helical antiferromagnet EuCo${}_2$P${}_2$ with an AFM ordering temperature $T_{\mathrm{N}}$ = 66.5 K. An incommensurate helical AFM structure was clearly confirmed by ${}^{153}$Eu and ${}^{31}$P NMR spectra on single crystalline EuCo${}_2$P${}_2$ in zero magnetic field at 1.6 K and its external magnetic field dependence. Furthermore, based on ${}^{59}$Co 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 $\pm$ 0.09)2$\pi$/$c$ where $c$ is the $c$-axis lattice parameter. The temperature dependence of k is also discussed.

8 pages, 10 figures, accepted for publication in Phys. Rev. B. arXiv admin note: substantial text overlap with arXiv:1704.06293

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