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Investigation of materials that exhibit quantum phase transition providesvaluable insights into fundamental problems in physics. We present neutronscattering under pressure in a triangular-lattice antiferromagnet which has aquantum disorder in the low-pressure phase and a noncollinear structure in thehigh-pressure phase. The neutron spectrum continuously evolves through thecritical pressure; a single mode in the disordered state becomes soft with thepressure, and it splits into gapless and gapped modes in the ordered phase.Extended spin-wave theory reveals that the longitudinal and transversefluctuations of spins are hybridized in the modes because of thenoncollinearity, and novel magnetic excitations are formed. We report a newhybridization of the phase and amplitude fluctuations of the order parameter ina spontaneously symmetry-broken state.

Novel Excitations near Quantum Criticality in Geometrically Frustrated Antiferromagnet CsFeCl$_{3}$