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The clathrate compound Ce3Pd20Si6 is a heavy-fermion metal that exhibitsmagnetically hidden order at low temperatures. Reputedly, this exotic type ofmagnetic ground state, known as "phase II", could be associated with theordering of Ce 4f quadrupolar moments. In contrast to conventional (dipolar)order, it has vanishing Bragg intensity in zero magnetic field and, as aresult, has escaped direct observation by neutron scattering until now. Here wereport the observation of diffuse magnetic neutron scattering induced by anapplication of magnetic field along either the [110] or the [001] directionwithin phase II. The broad elastic magnetic signal that surrounds the (111)structural Bragg peak can be attributed to a short-range G-typeantiferromagnetic arrangement of field-induced dipoles modulated by theunderlying multipolar order on the simple-cubic sublattice of Ce ions occupyingthe 8c Wyckoff site. In addition, for magnetic fields applied along the [001]direction, the diffuse magnetic peaks in Ce3Pd20Si6 become incommensurate,suggesting a more complex modulated structure of the underlying multipolarorder that can be continuously tuned by a magnetic field.

Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6