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We show that Ce- and Yb-based Kondo-lattice ferromagnets order mainly alongthe magnetically hard direction of the ground state Kramers doublet determinedby crystalline electric field (CEF). Here we argue that this peculiarphenomenon, that was believed to be rare, is instead the standard case.Moreover, it seems to be independent on the Curie temperature $T_\mathrm{C}$,crystalline structure, size of the ordered moment and type of ground state wavefunction. On the other hand, all these systems show the Kondo coherence maximumin the temperature dependence of the resistivity just above $T_\mathrm{C}$which indicates a Kondo temperature of a few Kelvin. An important role offluctuations is indicated by the non-mean-field like transition in specificheat measurements as well as by the suppression of this effect by a strongIsing-like anisotropy. We discuss possible theoretical scenarios.

Kondo-lattice ferromagnets and their peculiar order along the magnetically hard axis