Tricritical point from high-field magnetoelastic and metamagnetic effects in UN
| Autor: | Nicholas M. Harrison, D. J. Safarik, Daniel Antonio, Krzysztof Gofryk, Tomasz Durakiewicz, Marcelo Jaime, Keshav Shrestha, Daniel S. Mast, Jean-Christophe Griveau |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Multidisciplinary
Materials science Condensed matter physics Magnetic moment Field (physics) Science Magnetostriction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy Magnetic susceptibility Article Magnetic field Magnetization Tricritical point 0103 physical sciences Medicine Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Néel temperature |
| Zdroj: | Scientific Reports Scientific Reports, Vol 7, Iss 1, Pp 1-8 (2017) |
| ISSN: | 2045-2322 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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