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Simultaneous neutron-scattering and thermal expansion measurements on theheavy-fermion superconductor URu2Si2 under hydrostatic pressure of 0.67 GPahave been performed in order to detect the successive paramagnetic, hiddenorder, and large moment antiferromagnetic phases on cooling. The temperaturedependence of the sharp low energy excitation at the wavevector Q_0=(100) showsthat this excitation is clearly a signature of the hidden order state. In theantiferromagnetic phase, this collective mode disappears. The higher energyexcitation at the incommensurate wavevector Q_1=(1.4,0,0) persists in theantiferromagnetic phase but increases in energy. The collapse of the inelasticneutron scattering at Q_0 coincides with the previous observation of thedisappearance of superconductivity.

A signature of hidden order in URu2Si2 : the excitation at the wavevector Q0 = (100)