Investigation of the Field-Induced Phase Transitions in the (R,R)2Fe14B Rare-Earth Intermetallics in Ultrahigh Magnetic Fields


Investigation of the Field-Induced Phase Transitions in the (R,R)2Fe14B Rare-Earth Intermetallics in Ultrahigh Magnetic Fields

Kostyuchenko, N. V.; Tereshina, I. S.; Andreev, A. V.; Doerr, M.; Tereshina-Chitrova, E. A.; Paukov, M. A.; Gorbunov, D.; Politova, G. A.; Pyatakov, A. P.; Miyata, A.; Drachenko, O.; Zvezdin, A. K.; Portugall, O.

In this work, we perform a comparative study of the magnetization behavior of four series of compounds R2Fe14B and their hydrides R2Fe14BH5.5, and the compositions (Nd0.5R0.5)2Fe14B and their hydrides (Nd0.50.5)2Fe14BH5.5 with R and R´ = Ho, Er, and Tm. The magnetization is measured in pulsed magnetic fields up to 58 T and in megagauss fields up to 135 T at 5 K. The first and second critical fields of the field-induced transitions, Hc1 and Hc2 were estimated analytically and the results were verified against experimental data. We find that hydrogenation of R2Fe14B and (Nd0.50.5)2Fe14B reduces drastically the Hc1 and Hc2 values and, as a consequence, the intersublattice R–Fe exchange interaction parameter λ.

Permalink: https://www.hzdr.de/publications/Publ-32168
Publ.-Id: 32168