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

Hidden order phases that occur in a number of correlated f electron systems are among the most elusive states of electronic matter. Their investigations are hindered by the insensitivity of standard physical probes, such as neutron diffraction, to the order parameter that is usually associated with higher order multipoles of the f orbitals. The heavy fermion compound Ce3Pd20Si6 exhibits magnetically hidden order at subkelvin temperatures, known as phase II. Additionally, for magnetic amp; 64257;eld applied along the [001] cubic axis, another phase II was detected, but the nature of the transition from phase II to phase II remained unclear. Here we use inelastic neutron scattering to argue that this transition is most likely associated with a change in the propagation vector of the antiferroquadrupolar order from 111 to 100 . Despite the absence of magnetic Bragg scattering in phase II , its ordering vector is revealed by the location of an intense magnetic soft mode at the 100 wave vector, that is orthogonal to the applied amp; 64257;eld. At the II II transition, this mode softens and transforms into quasielastic and nearly Q independent incoherent scattering, which is likely related to the non Fermi liquid behavior recently observed at this transition. Our experiment also reveals sharp collective excitations in the amp; 64257;eld polarized paramagnetic phase, after phase II is suppressed in amp; 64257;elds above 4 T