We present detailed data from low-temperature magnetization, magnetoresistance, and specific heat measurements on single-crystal YbNiSi 3 with the magnetic field applied along the easy magnetic axis, H ʈ b. An initially antiferromagnetic ground state changes into a field-stabilized metamagnetic phase at ϳ16 kOe ͑T → 0͒. On further increase of the magnetic field, magnetic order is suppressed at ϳ85 kOe. No non-Fermiliquid-like power law was observed in the resistivity in the vicinity of the

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... cal field for T ജ 0.4 K. Heat capacity measurements suggest that the applied magnetic field splits the nearly degenerate crystal-electric-field levels that form the zero-field ground state of YbNiSi 3 . The functional behaviors of the resistivity and specific heat are discussed in comparison with those of the few other stoichiometric heavy fermion compounds with established field-induced quantum critical points.