Magnetic susceptibility of the Pd–Co–H system

• Published in: Journal of alloys and compounds 2013-12, Vol.580, p.S102-S104
• Main Authors: Akamaru, Satoshi, Matsumoto, Takashi, Hara, Masanori, Nishimura, Katsuhiko, Nunomura, Norio, Matsuyama, Masao
• Format: Article
• Language: English
• Subjects: Alloys; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Electronic band structure; Exact sciences and technology; Fermi surface: calculations and measurements; effective mass, g factor; Hydrogen absorbing materials; Hydrogen storage; Isotherms; Magnetic measurements; Magnetic permeability; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetic susceptibility; Magnetically ordered materials: other intrinsic properties; Methods of electronic structure calculations; Palladium; Pd–Co alloy; Physics; Saturation moments and magnetic susceptibilities; Transition temperature; Uptakes
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.03.097

•We measure magnetic susceptibility and pressure-composition isotherm of Pd–Co–H system.•The plateau pressure increases with increasing Co content.•The magnetic susceptibility decreases linearly with increasing hydrogen.•The magnetic susceptibility in β phase is small and decreased moderately.•The change of magnetic susceptibility is attributed to introducing electron by hydrogen. 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.