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Insight into the physics of the 5f -band antiferromagnet U2Ni2Sn from the pressure dependence of crystal structure and electrical resistivity

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Kozelj,  Primoz
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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König,  Markus
Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Svanidze,  Eteri
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Maskova-Cerna, S., Kolomiets, A., Prchal, J., Halevy, I., Buturlim, V., Nikolaevsky, M., et al. (2021). Insight into the physics of the 5f -band antiferromagnet U2Ni2Sn from the pressure dependence of crystal structure and electrical resistivity. Physical Review B, 103: 035104, pp. 1-15. doi:10.1103/PhysRevB.103.035104.


Cite as: http://hdl.handle.net/21.11116/0000-0007-DB2A-4
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.