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The ternary uranium compound UCu$_2$Sn with a hexagonal ZrPt$_2$Al-typestructure shows a phase transition at 16 K. We reported previously that hugelattice-softening is accompanied by the phase transition, which originates fromferroquadrupolar ordering of the ground state non-Kramers doublet $\Gamma_5$. Amacroscopic strain, which is expected to emerge spontaneously, was not detectedby powder X-ray diffraction in the temperature range between 4.2 and 300 K. Tosearch the spontaneous strain, we have carried out thermal expansionmeasurements on a single-crystalline sample along the $a$, $b$ and $c$ axesusing a capacitance technique with the resolution of $10^{-8}$. In the presentexperiment, we found the spontaneous $e_{xx} - e_{yy}$ strain which couples tothe ground state doublet $\Gamma_5$. The effect of uniaxial pressure along the$a$, $b$ and $c$ axes on the transition temperature is also discussed.Comment: 4 pages, 5 figures, submitted to Phys. Rev.

physical review. b, condensed matter

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Spontaneous strain due to ferroquadrupolar ordering inUCu2Sn