Influence of hydrogen in solution on the magnetism of monocrystalline thulium

• Published in: Journal of physics. Condensed matter 1989-07, Vol.1 (26), p.4099-4109
• Main Authors: Vajda, P, Daou, J N, Burger, J P, Hilscher, G, Pillmayr, N
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic anisotropy; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Materials science; Metals, semimetals and alloys; Other topics in magnetic properties and materials; Physics; Specific materials
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/1/26/006

The electrical resistivities of monocrystalline Tm and of the solid solutions alpha -TmH sub x , x < = 0.1, have been measured along the c axis and the b axis in the temperature range 2 < = T < = 300K. The Neel temperature T sub N for both orientations and the spin-disorder resistivity rho sub mag exp 0,b of the b axis specimens decrease with increasing x, owing to decreasing conduction electron density and weakening RKKY interaction, while the residual resistivity rho sub r exp b increases linearly by 4.0(1) mu Omega cm (at.% H) exp --2 in solution. For the c axis specimens, one observes a strong non-linear increase in rho sub r exp c with increasing x, even suppressing the original diminution in rho in the ordered state; this is interpreted by an H-induced evolution of the superzone boundaries. The temperature dependence of the magnetic resistivity term rho sub m exp b (T) in the basal plane is not easily understood through a simple excitation mechanism but is best fitted through a combination: rho sub m exp b (T) proportional to AT exp n + BT sub 2 exp(-- Delta /kT), where the power n and the gap Delta both decrease with increasing x. 16 ref.--AA