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Magnetic transition phenomena in cubic chiral antiferromagnet EuPtSi with$T_{\rm N}$=4.0~K were investigated by means of single crystal neutrondiffraction. At 0.3~K in the ground state, magnetic peaks emerge at positionsrepresented by an ordering vector ${q}_{1}$=$(0.2, 0.3, 0)$ and its cyclicpermutation. Upon heating, an additional magnetic peak splitting withhysteresis was uncovered at around $T^*_{\rm N}{\sim}$2.5~K, indicating thepresence of a first-order commensurate-incommensurate transition with${q}^*_{1}$=$(0.2, 0.3, {\delta})$ (${\delta}_{\rm max}{\simeq}$0.04) at$T^*_{\rm N}$. A half-polarized neutron scattering experiment for polarizationparallel to the scattering vector revealed that polarization antiparallel tothe scattering vector has stronger intensity in both magnetic phases. Thisfeature clarifies the single chiral character of the helical structure withmoments lying perpendicular to the ordering vector in both ordered states.Under a vertical magnetic field of 1.2~T for ${B}{\parallel}$[1,1,1] at 1.9~Kentering into the so-called $A$ phase, magnetic peaks form characteristichexagonal patterns in the equatorial scattering plane around nuclear peaks. Anordering vector ${q}_{A}{\simeq}({\pm}0.09, {\pm}0.20, {\mp}0.28)$ of the$A$-phase has similar periodic length as $q_{1}$, and could be the hallmark ofa formation of skyrmion lattice in EuPtSi.

Unique Helical Magnetic Order and Field-Induced Phase in Trillium Lattice Antiferromagnet EuPtSi