期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 681, 期 -, 页码 275-282出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.04.226
关键词
Uranium intermetallics; UCoAl; Itinerant metamagnetism
资金
- Czech Science Foundation [16-03593S]
- Czech Research Infrastructures Project [LM2011025]
- High Magnetic Field Laboratory Dresden (HLD) at HZDR, European Magnetic Field Laboratory (EMFL)
UCoAl is a 5f-band metamagnet with a uniquely low paramagnetic-to-ferromagnetic transition field, 0.7 T, extremely sensitive to any perturbation such as elemental substitution. Here, we study variations of magnetic properties in the UCoAl-UOsAl system on single-and polycrystalline samples with different concentration of Os. We found that osmium can substitute Co in UCoAl up to 20%, while preserving the ZrNiAl structure type. Pure UOsAl was identified as a hexagonal Laves phase, MgZn2 type. It is a weak Pauli paramagnet. Even a 2%-substitution of Os for Co in the 5f band metamagnet stabilizes ferromagnetism with the Curie temperature T-C = 26 K and uranium magnetic moment mu(U) = 0.4 mu(B) and shifts the critical metamagnetic field to zero. Higher Os concentrations enhance both T-C and beta(U). All magnetic response is concentrated into the c-axis; the susceptibility for magnetic field perpendicular to c is low and practically temperature-independent. Our study reflects the decisive role of the 5f-5d hybridization in the magnetism of the UCoAl-UOsAl system. This work completes the study of the alloying of UCoAl with late transition metals and indicates that the non-magnetic phase exhibiting band metamagnetism is very limited in the concentration range. (C) 2016 Elsevier B.V. All rights reserved.
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