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Small spontaneous lattice distortion of a cubic ferromagnet at temperaturesbelow $T_{\mathrm{C}}$ is expected, but usually a neglected phenomenon. Thisstudy is focused on such effect on the example of $\mathrm{U_{4}Ru_{7}Ge_{6}}$.We propose the lattice distortion from the cubic space group to a lowersymmetry as a result of our DFT calculations. The strong spin-orbit coupling onthe U site plays the most essential role, that should lower the symmetry of thesystem and give rise to the two different U sites (U1 and U2). We bringconvincing experimental evidence for this splitting resulting from ourpolarized neutron diffraction experiment. Proper treatment of the flippingratios collected in the ordered state and in the paramagnetic state revealsdramatically different magnetic moments on the U1 and U2 sites. We have reachedgood agreement of the results from the MAXENT method and from direct fitting ofthe data. The ratio of the orbital and spin component on the U2 site is lowerthan for the free $\mathrm{U^{3+}}$ or $\mathrm{U^{4+}}$ ion and points to astrong hybridization between the U $5f$ and Ru $4d$ wave functions. The sameratio on the U1 site is unexpectedly low. This would mean that its orbitalcomponent is almost quenched. We have observed the absence of a magnetic momenton the Ru1 site, but a rather large induced moment on the Ru2 site. Verysimilar results were obtained also in the paramagnetic state in the regimeinduced by the magnetic field. It points to the intimate coupling of themagnetic ordering and structural distortion as it is possible to split the Usite in to two different polarizing paramagnetic U moments above$T_{\mathrm{C}}$ by a strong magnetic field. We propose that the differencebetween the magnetic moment on the U sites is caused by the change of localpoint symmetry of the sites that is tightly bound to the role of the strongspin-orbit interaction.

Effect of lattice distortion on U magnetic moments in $\mathrm{U_{4}Ru_{7}Ge_{6}}$ studied by polarized neutron diffraction