Magnetic Properties of Zr-Doped Lu$_{2}$Fe$_{17}$ Single Crystal and Its Hydride

Influence of Zr-substitution on magnetic properties of (Lu $_{1-x}$Zr $_{x}$) $_{2}$Fe $_{17}$ single crystals was investigated. The homogeneity range of (Lu$_{1-x}$ Zr$_{x}$ )$_{2}$ Fe$_{17}$ compounds extends from $x= 0$ to 0.2, since the compound with a higher Zr content, $x= 0.4$, was found to be multiphase. In (Lu$_{0.8}$ Zr$_{0.2}$ )$_{2}$ Fe$_{17}$ , antiferromagnetism present in Lu $_{2}$Fe $_{17}$ compound is totally suppressed upon Zr substitution and ferromagnetism is stabilized in the whole range of magnetic ordering with a considerable increase of magnetic ordering temperature from 274 K in Lu$_{2}$ Fe$_{17}$ to 325 K in (Lu$_{0.8}$ Zr$_{0.2}$ )$_{2}$ Fe$_{17}$ . Successful hydrogenation without destroying the single-crystalline structure of (Lu$_{0.8}$ Zr$_{0.2}$ )$_{2}$ Fe$_{17}$ compound was performed, and (Lu$_{0.8}$Zr$_{0.2}$)$_{2}$Fe$_{17}$H$_{0.48}$ hydride was obtained. Hydrogenation of (Lu$_{0.8}$Zr$_{0.2}$)$_{2}$Fe$_{17}$ resulted in increase of $T_{C}$ from 325 K to 365 K...