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We present magnetization, specific heat, and 27Al NMR investigations onYbFe2Al10 over a wide range in temperature and magnetic field. The magneticsusceptibility at low temperatures is strongly enhanced at weak magneticfields, accompanied by a ln(T0/T) divergence of the low-T specific heatcoefficient in zero field, which indicates a ground state of correlatedelectrons. From our hard X-ray photo emission spectroscopy (HAXPES) study, theYb valence at 50 K is evaluated to be 2.38. The system displays valencefluctuating behavior in the low to intermediate temperature range, whereasabove 400 K, Yb3+ carries a full and stable moment, and Fe carries a moment ofabout 3.1 mB. The enhanced value of the Sommerfeld Wilson ratio and the dynamicscaling of spin-lattice relaxation rate divided by T [27(1/T1T)] with staticsusceptibility suggests admixed ferromagnetic correlations. 27(1/T1T)simultaneously tracks the valence fluctuations from the 4f -Yb ions in the hightemperature range and field dependent antiferromagnetic correlations amongpartially Kondo screened Fe 3d moments at low temperature, the latter evolveout of an Yb 4f admixed conduction band.

Contiguous 3d and 4f magnetism: towards strongly correlated 3d electrons in YbFe2Al10