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Abstract:
A resistivity study of a single crystal of U2Ni2Sn has been performed at ambient pressure and under hydrostatic pressure up to p=3.3GPa. It revealed Fermi-liquid behavior accompanied by spin excitations with an energy gap Δ=30-55K in the whole pressure range. The Néel temperature varies with pressure in a nonmonotonous way. It increases at the rate dTN/dp=+0.6K/GPa, and later, after passing through the maximum at ≈3 GPa, it starts to decrease quickly. High-pressure x-ray diffraction indicated that an orthorhombic distortion of the tetragonal structure takes place around the pressure of this TN maximum. The computational study based on the density functional theory illustrates that the loss of magnetism in U2Ni2Sn with pressure is primarily due to 5f-band broadening, which results from the collapse of the U spacing within the U-U dimers. © 2021 American Physical Society.
