Investigation of the Field-Induced Phase Transitions in the (R,R′) 2 Fe 14 B Rare-Earth Intermetallics in Ultrahigh Magnetic Fields

摘要: In this work, we perform a comparative study of the magnetization behavior four series compounds R2Fe14B and their hydrides R2Fe14BH5.5, compositions (Nd0.5R0.5)2Fe14B (Nd $_{0.5}\text{R}^\prime _{0.5})_{2}$ Fe14BH5.5 with R $\text{R}^\prime =$ Ho, Er, Tm. The is measured in pulsed magnetic fields up to 58 T megagauss 135 at 5 K. first second critical field-induced transitions, $H_{c1}$ $H_{c2}$ were estimated analytically results verified against experimental data. We find that hydrogenation Fe14B reduces drastically values and, as consequence, intersublattice R–Fe exchange interaction parameter $\lambda $ .