Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

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Magnetoelastic coupling across the field-induced transition of uranium mononitride
Gorbunov, D.; Nomura, T.; Zvyagin, A. A.; Henriques, M. S.; Andreev, A. V.; Skourski, Y.; Zvyagina, G. A.; Troc, R.; Zherlitsyn, S.; Wosnitza, J.;
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.

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Publ.-Id: 29502 - Permalink