On the pressure and temperature dependence of ordering temperature and magnetization of Y.sub.1-x./sub.Th.sub.x./sub.Co.sub.4./sub.B compounds

0346536 - FZÚ 2011 RIV US eng J - Journal Article
Mayot, H. - Isnard, O. - Arnold, Zdeněk - Kamarád, Jiří
On the pressure and temperature dependence of ordering temperature and magnetization of Y_1-xTh_xCo₄B compounds.
Journal of Applied Physics. Roč. 107, č. 10 (2010), 103921/1-103921/8. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA ČR GA202/09/1027
Institutional research plan: CEZ:AV0Z10100521
Keywords : cobalt compounds * compressibility * crystal structure * Curie temperature * high-pressure effects * magnetic anisotropy * magnetic transitions
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.064, year: 2010

We present here a detailed investigation of the pressure dependence of the structural and magnetic properties in a wide temperature range from 5 to 340 K for the Y1-xThxCo4B series. The unit cell lattice compressibility has been determined from powder neutron diffraction technique in the 0 to 0.5 GPa pressure range. Substitution of Th for Y is found to reduce significantly the compressibility. The Curie temperature decreases dramatically upon the Th for Y substitution. Studies were performed on polycrystalline samples under hydrostatic pressure up to 1.1 GPa and in magnetic field up to 5 T. The evolution of the saturation magnetization under pressure is presented as well as the pressure dependence of the Curie temperature. Remarkable pressure effects on the Curie temperature and on the critical field at which the first order magnetization process occurs for Y0.8Th0.2Co4B are analyzed and discussed.
Permanent Link: http://hdl.handle.net/11104/0187544