Tricritical point from high-field magnetoelastic and metamagnetic effects in UN
Abstract Uranium nitride (UN) is one of the most studied actinide materials as it is a promising fuel for the next generation of nuclear reactors. Despite large experimental and theoretical efforts, some of the fundamental questions such as degree of 5 f–electron localization/delocalization and its...
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2017
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oai:doaj.org-article:0e8a92dac1594e8fb3f5b9920782a8312021-12-02T15:06:21ZTricritical point from high-field magnetoelastic and metamagnetic effects in UN10.1038/s41598-017-06154-72045-2322https://doaj.org/article/0e8a92dac1594e8fb3f5b9920782a8312017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06154-7https://doaj.org/toc/2045-2322Abstract Uranium nitride (UN) is one of the most studied actinide materials as it is a promising fuel for the next generation of nuclear reactors. Despite large experimental and theoretical efforts, some of the fundamental questions such as degree of 5 f–electron localization/delocalization and its relationship to magneto-vibrational properties are not resolved yet. Here we show that the magnetostriction of UN measured in pulsed magnetic fields up to 65 T and below the Néel temperature is large and exhibits complex behavior with two transitions. While the high field anomaly is a field-induced metamagnetic-like transition and affects both magnetisation and magnetostriction, the low field anomaly does not contribute to the magnetic susceptibility. Our data suggest a change in the nature of the metamagnetic transition from first to second order-like at a tricritical point at T tri ∼ 24 K and H tri ∼ 52 T. The induced magnetic moment at 60 T might suggest that only one subset of magnetic moments has aligned along the field direction. Using the results obtained here we have constructed a magnetic phase diagram of UN. These studies demonstrate that dilatometry in high fields is an effective method to investigate the magneto-structural coupling in actinide materials.K. ShresthaD. AntonioM. JaimeN. HarrisonD. S. MastD. SafarikT. DurakiewiczJ.-C. GriveauK. GofrykNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017) |
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Medicine R Science Q K. Shrestha D. Antonio M. Jaime N. Harrison D. S. Mast D. Safarik T. Durakiewicz J.-C. Griveau K. Gofryk Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| description |
Abstract Uranium nitride (UN) is one of the most studied actinide materials as it is a promising fuel for the next generation of nuclear reactors. Despite large experimental and theoretical efforts, some of the fundamental questions such as degree of 5 f–electron localization/delocalization and its relationship to magneto-vibrational properties are not resolved yet. Here we show that the magnetostriction of UN measured in pulsed magnetic fields up to 65 T and below the Néel temperature is large and exhibits complex behavior with two transitions. While the high field anomaly is a field-induced metamagnetic-like transition and affects both magnetisation and magnetostriction, the low field anomaly does not contribute to the magnetic susceptibility. Our data suggest a change in the nature of the metamagnetic transition from first to second order-like at a tricritical point at T tri ∼ 24 K and H tri ∼ 52 T. The induced magnetic moment at 60 T might suggest that only one subset of magnetic moments has aligned along the field direction. Using the results obtained here we have constructed a magnetic phase diagram of UN. These studies demonstrate that dilatometry in high fields is an effective method to investigate the magneto-structural coupling in actinide materials. |
| format |
article |
| author |
K. Shrestha D. Antonio M. Jaime N. Harrison D. S. Mast D. Safarik T. Durakiewicz J.-C. Griveau K. Gofryk |
| author_facet |
K. Shrestha D. Antonio M. Jaime N. Harrison D. S. Mast D. Safarik T. Durakiewicz J.-C. Griveau K. Gofryk |
| author_sort |
K. Shrestha |
| title |
Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| title_short |
Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| title_full |
Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| title_fullStr |
Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| title_full_unstemmed |
Tricritical point from high-field magnetoelastic and metamagnetic effects in UN |
| title_sort |
tricritical point from high-field magnetoelastic and metamagnetic effects in un |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/0e8a92dac1594e8fb3f5b9920782a831 |
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