Abstract
The magnetic and structural influences of hydrogen absorption were studied on the itinerant electron metamagnet YCo2. The system YCo2Hx forms two crystalline hydrides of the α phase (0<x<0.3) and the β phase (1.5<x≤3.5). The hydride samples also include small amounts of the non-intrinsic ferromagnetic component due to the partial structural disordering upon hydrogen absorption. The high field susceptibility indicated that the α phase is an itinerant electron metamagnet in which the critical field is possibly lower than that of YCo2. The β phase has no metamagnetic transition. The hydrogen-induced changes in the magnetic properties are discussed on the basis of the itinerant electron magnetism.
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