Abstract
We present the results of combined macroscopic [x-ray diffraction (XRD)] and microscopic [nuclear magnetic resonance (NMR)] studies on cubic UPtSn. From the $^{119}\mathrm{Sn}$ and $^{195}\mathrm{Pt}$ NMR spectra the occurrence of the phase transition suggested by the specific heat anomaly at ${T}_{0}=35\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ has been confirmed. The observation of anisotropic line shapes of both $^{119}\mathrm{Sn}$ and $^{195}\mathrm{Pt}$ resonances provides direct microscopic evidence for the symmetry lowering below ${T}_{0}$, although no lattice distortion was observed in the XRD experiment. Such a behavior is attributed to the occurrence of long-range uranium $5f$-orbital ordering.
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