Magnetoelastic coupling across the field-induced transition of uranium 
mononitride

Gorbunov I, D.; Nomura, T.; Zvyagin, A. A.; Henriques, M. S.; Andreev V, A.; Skourski, Y.; Zvyagina, G. A.; Troc, R.; Zherlitsyn, S.; Wosnitza, J.

doi:10.1103/PhysRevB.100.024417

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Magnetoelastic coupling across the field-induced transition of uranium mononitride

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Zvyagin, A. A.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Gorbunov I, D., Nomura, T., Zvyagin, A. A., Henriques, M. S., Andreev V, A., Skourski, Y., et al. (2019). Magnetoelastic coupling across the field-induced transition of uranium mononitride. Physical Review B, 100(2): 024417. doi:10.1103/PhysRevB.100.024417.

Cite as: https://hdl.handle.net/21.11116/0000-0004-B013-F

Abstract

Uranium mononitride (UN) displays a spin-flop-like transition for magnetic field applied along all principal crystallographic directions just below 60 T. Here, we report on ultrasound and magnetocaloric-effect results for UN in pulsed magnetic fields up to 65 T. The field-induced phase transition causes a discontinuous temperature decrease, indicating a larger magnetic entropy above the transition. Furthermore, we find pronounced anomalies in the acoustic properties, which signals strong spin-lattice interactions. A further anomaly observed at fields slightly above the transition is likely related to the formation of magnetic domains. A model based on the exchange-striction coupling mechanism well reproduces the strong renormalization of the acoustic properties.