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Hidden-order phases that occur in a number of correlated f-electron systemsare among the most elusive states of electronic matter. Their investigationsare hindered by the insensitivity of standard physical probes, such as neutrondiffraction, to the order parameter that is usually associated withhigher-order multipoles of the f-orbitals. The heavy-fermion compoundCe3Pd20Si6 exhibits magnetically hidden order at subkelvin temperatures, knownas phase II. Additionally, for magnetic field applied along the [001] cubicaxis, another phase II' was detected, but the nature of the transition fromphase II to phase II' remained unclear. Here we use inelastic neutronscattering to demonstrate that this transition is associated with a change inthe propagation vector of the antiferroquadrupolar order from (111) to (100).Despite the absence of magnetic Bragg scattering in phase II', its orderingvector is revealed by the location of an intense magnetic soft mode at the(100) wave vector, orthogonal to the applied field. At the II-II' transition,this mode softens and transforms into quasielastic and nearly Q-independentincoherent scattering, which is likely related to the non-Fermi-liquid behaviorrecently observed at this transition. Our experiment also reveals sharpcollective excitations in the field-polarized paramagnetic phase, after phaseII' is suppressed in fields above 4 T.

Evolution of the propagation vector of antiferroquadrupolar phases in Ce3Pd20Si6 with magnetic field