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We report on neutron scattering studies of a rare earth intermetalliccompound ErNi$_{2}$Ge$_{2}$. Polarized neutron scattering experiments revealedthat the magnetic ordered moment ${\bm m}$ lies in ab-plane. Taking account ofa lack of the third higher harmonic reflection, ErNi$_{2}$Ge$_{2}$ isconsidered to have a helical magnetic structure. The magnetic scatteringprofiles along the $[100]^{\ast}$- and the $[110]^{\ast}$-directions are welldescribed by the sum of Gaussian and modified-Lorentzian terms, even far below$T_{\scriptsize N}$, indicating that short-range orders coexist with along-range order. Interestingly, the modified-Lorentzian-type diffusescattering is not present in the profiles along the $[001]^{\ast}$-direction.The anisotropy of the diffuse scattering suggests that the short-range-orderconsists of one dimensional long-range helices along the c-axis.

Anisotropic magnetic diffuse scattering in an easy-plane type antiferromagnet ErNi$_{2}$Ge$_{2}$