Abstract
Abstract In this study, the magnetic susceptibility of the Pd–Co–H system was simultaneously measured with pressure–composition isotherms at ambient temperature. The magnetic susceptibility of the system abruptly decreased as the hydrogen content increased to 0.02 for all Pd–Co alloys under study. In the plateau region, the susceptibility decreased linearly with an increase in hydrogen uptake. The single metal hydride phase exhibited weak magnetic susceptibility. These behaviours were qualitatively interpreted in terms of the electronic structure of the Pd–Co–H system. The unoccupied down-spin band of Co just above the Fermi level gradually decreased with increasing hydrogen uptake; thus, the magnetic moment arising from uncompensated spin reduced, and the ferromagnetic transition temperature decreased.
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