Crystal growth of magnetic dihydride GdxY1−xH2 for generation of spin current

• Published in: Journal of crystal growth 2013-09, Vol.378, p.351-355
• Main Authors: Sakuraba, T., Hirama, H., Sakai, M., Honda, Z., Hayakawa, M., Okoshi, T., Kitajima, A., Oshima, A., Higuchi, K., Hasegawa, S.
• Format: Article
• Language: English
• Subjects: A1. Phase diagrams; A2. Physical vapor deposition processes; B1. Gadolinium compounds; B1. Yttrium compounds; B2. Magnetic materials; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Conductivity phenomena in semiconductors and insulators; Cross-disciplinary physics: materials science; rheology; Electronic transport in condensed matter; Exact sciences and technology; Galvanomagnetic and other magnetotransport effects; Materials science; Methods of crystal growth; physics of crystal growth; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/j.jcrysgro.2012.12.156

Crystal growth of pure phases of GdxY1−xH2 (0≤x≤1) was successfully carried out by depositing GdxY1−x films and their hydrogenation, the growth results of which were investigated by X-ray diffraction measurements as well as temperature (T) dependence of magnetic susceptibility (χ). The fcc lattice constant in GdxY1−xH2 is found to be linearly increased with increasing x. Behavior characteristic to the para-to-antiferromagnetic transition are clearly observed in the χ–T curve for x=0.39, 0.47, 0.76, and 1.0 cases. The Néel temperature (TN) is found to be linearly decreased with decreasing x from x=1.0 (GdH2), and is predicted to show TN=0K at x∼0.1 by extrapolating TN from large x region, implying the antiferromagnetic order disappears at x∼0.1. The quasi-zero Hall effect was observed for x=0, 0.19, 0.37, 0.39, and 0.47 cases, whereas a moderate Hall effect is observed for x=0.76 and 1.0 cases. The type of Hall effect is also discussed. ► The conditions for obtaining the pure phases of GdxY1−xH2(0≤x≤1) were determined. ► The exact aspect of magnetic and magnetotransport properties in GdxY1−xH2(0≤x≤1) was revealed. ► The quasi-zero Hall effect was observed in GdxY1−xH2 with x=0, 0.19, 0.37, 0.39, and 0.47 cases.