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Using a small amount of radioactive 111Cd atoms implanted in cerium latticeto probe the hyperfine electric quadrupole interaction, we have detected aquadrupole electron charge density component in alpha-Ce, which is absent ingamma-Ce. The appearance of the quadrupole density in alpha-Ce predicted by thequadrupole scenario of the phase transition demonstrates that the spacialsymmetry is lowered at the gamma->alpha phase transition. This finding makescerium the first element where the symmetry change is driven exclusively by thevalence electron degrees of freedom while the atomic centers of mass (ceriumnuclei) occupy the face centered cubic positions. We also report on nuclearquadrupole interactions in other high pressure phases of cerium: alpha' (C2/mspace symmetry) and alpha' (alpha-U structure).

The gamma->alpha phase transition in cerium is not isostructural