Magnetic phase transitions and magnetoelastic phenomena in UNiGa under pressure

• Published in: Journal of the Physical Society of Japan Vol. 66; no. 7; pp. 1904 - 1907
• Main Authors: HONDA, F, KAGAYAMA, T, OOMI, G, ANDREEV, A. V, HAVELA, L, SECHOVSKY, V, PROKES, K, BRÜCK, E
• Format: Journal Article
• Language: English
• Published: Tokyo Institute of Pure and Applied Physics 1997; Physical Society of Japan; The Physical Society of Japan
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetomechanical and magnetoelectric effects, magnetostriction; Metals. Metallurgy; Physics; Thermal expansion; Monocrystals; Pressure effects; Nickel alloys; Magnetostriction; Magnetic-phase transformations; Ternary alloys; Magnetic-phase diagrams; Uranium alloys; Magnetoelastic effects; Experimental study; Gallium alloys
• ISSN: 0031-9015; 1347-4073
• DOI: 10.1143/jpsj.66.1904

Thermal expansion and magnetostriction of UNiGa single crystal have been measured at the range of pressures up to 2.2, GPa and magnetic fields up to 1.5, T. The results are reported with a special emphasis on anomalies accompanying the magnetic phase transitions and the effect of pressure on the critical parameters (transition temperature and magnetic field). Formation of a new antiferromagnetic phase induced by pressures above 1.8, GPa is revealed. Analysis of results enabled us to construct P-T magnetic phase diagrams for fields up to 1.5, T. The magnetoelastic effects are discussed in terms of marked variations in electronic structure accompanying transitions between different magnetic structures with various couplings of U magnetic moments along the c-axis and involvement of strong spin-orbit interaction.