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Tuning of the electronic properties of heavy fermion compounds by chemicalsubstitutions provides excellent opportunities to further understand thephysics of hybridized ions in crystal lattices. Here we present aninvestigation on the effects of Cd doping in flux-grown single crystals of thecomplex intermetallic cage compound YbFe$_{2}$Zn$_{20}$, that has beendescribed as a heavy fermion with Sommerfeld coefficient of 535 mJ/mol.K$^{2}$.Substitution of Cd for Zn disturbs the system by expanding the unit cell and,in this case, the size of the Zn cages that surround Yb and Fe. With increasingamount of Cd, the hybridization between Yb $4f$ electrons and the conductionelectrons is weakened, as evidenced by a decrease in the Sommerfeldcoefficient, which should be accompanied by a valence shift of the Yb$^{3+}$due to the negative chemical pressure effect. This scenario is also supportedby the low temperature dc-magnetic susceptibility, that is gradually suppressedand evidences an increment of the Kondo temperature, based on a shift to highertemperatures of the characteristic broad susceptibility peak. Furthermore, theDC resistivity decreases with the isoelectronic Cd substitution for Zn,contrary to the expectation for an increasingly disordered system, and implyingthat the valence shift is not related to charge carrier doping. The combinedresults demonstrate excellent complementarity between positive physicalpressure and negative chemical pressure, and point to a rich playground forexploring the physics and chemistry of strongly correlated electron systems inthe general family of Zn$_{20}$ compounds, despite their structural complexity.

Tuning the electronic hybridization in the heavy fermion cage compound YbFe$_{2}$Zn$_{20}$ with Cd-doping