Magnetic properties of ternary rare-earth transition-metal compounds

Determination of the crystal field parameters in SmFe11Ti

“…Thus, DyFe 11 Ti has an unusually strong anisotropy in the basal plane, which persists up to room temperature and above. Accordingly, A 4 4 of DyFe 11 Ti is indisputably large [23]. As opposed to that, SmFe 11 Ti has practically no anisotropy in the basal plane down to the lowest temperature; therefore, its A 4 4 is imperceptibly small.…”

“…Accordingly, A 4 4 of DyFe 11 Ti is indisputably large [23]. As opposed to that, SmFe 11 Ti has practically no anisotropy in the basal plane down to the lowest temperature; therefore, its A 4 4 is imperceptibly small. At the same time, both compounds are perfectly isomorphous members of the RFe 11 Ti family and, by a long-standing intuitive principle, their CFPs should be close.…”

“…One is left to guess if their crystal was twinned (or suspected of being twinned) or they simply attached no importance to this fact as being irrelevant to industrial application. They were certainly not unaware of it and it was on these grounds that the nonaxial CFPs were excluded from the outset: A 4 4 = 0, A 4 6 = 0. In our analysis, too, the uniaxial symmetry of SmFe 11 Ti is heavily relied on.…”

“…[5,7,8]) to that of Stevens (used in Refs. [4,6,18]). More specifically, the crystal-field Hamiltonian used in this work is the same as in Ref.…”

“…Theoretically, the case of R = Sm is more difficult (and interesting) because of a strong J-mixing effect [4]. An analytical approach based on perturbation theory was tested successfully on Sm 2 Co 17 [5].…”