Tricritical point from high-field magnetoelastic and metamagnetic effects in UN
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States); Univ. of Nevada, Las Vegas, NV (United States). Dept. of Chemistry and Biochemistry, High Pressure Science and Engineering Center
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Maria Curie-Sklodowska Univ., Lublin (Poland). Inst. of Physics
- European Commission, Karlsruhe (Germany). Joint Research Centre
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.
- Research Organization:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC07-05ID14517; DMR-1157490; AC52-06NA25396
- OSTI ID:
- 1395024
- Alternate ID(s):
- OSTI ID: 1407862; OSTI ID: 1412856; OSTI ID: 1498253
- Report Number(s):
- LA-UR-17-30081; LA-UR-16-28832; INL/JOU-16-40525-Rev000; PII: 6154
- Journal Information:
- Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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