We report the results of muon spin relaxation () and NMR measurements carried out on the cubic chiral magnet EuPtSi. This compound exhibits a helimagnetic transition at K, and hosts a unique skyrmion phase characterized by a short modulation period and strong anisotropy under magnetic fields. Our zero-field experiments revealed the development of critical slowing down of Eu spin fluctuations over a relatively wide critical region above . We also found from NMR that the spin fluctuations are strongly suppressed by magnetic field in the paramagnetic state above 20 K. These characteristic spin dynamics observed over a wide region of temperature and magnetic field suggest the presence of magnetic frustration in the spin system. Such frustration would underlie the mechanism stabilizing the short-period skyrmion lattice observed in this compound.
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