Amorphous 5f Ferromagnetic Hydrides UH3Mox |
| I. Tkacha, N.T.H. Kim-Nganb, S. Maškovaa, A.V. Andreevc, Z. Matěja, L. Havelaa
aFaculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic bInstitute of Physics, Pedagogical University, Podchorazych 2, 30 084 Krakow, Poland cInstitute of Physics, ASCR, Na Slovance 2, 182 21 Prague, Czech Republic |
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| γ-U metal, stabilized down to room temperature in the bcc structure by Mo doping, can absorb hydrogen at high H2 pressures only. The product is amorphous hydride UH3Mox analogous to β-UH3. Such hydrides are ferromagnetic with high Curie temperatures (up to 200 K), enhanced with respect to β-UH3. Magnetic moment of U also increases. Large disorder together with high anisotropy lead to a very high coercivity, reaching 4 T at low temperatures. As amorphization normally tends to suppress magnetic ordering of U compounds, such hydrides represent a new class of materials, amorphous U-based ferromagnets with relatively high Curie temperature. |
DOI: 10.12693/APhysPolA.126.292 PACS numbers: 75.50.Kj, 75.50.Vv, 72.15.Cz |