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We report on the hitherto unknown compound CeZn2-dGe2 (d approx 0.41). Wefind this compound to crystallize in a defect version of the well-knownCaBe2Ge2 structure type. The phase forms in a Zn/In flux and with Zn-deficiencyon one of its crystallographic sites. We find the compound to display uncommonlocalized Ce-based (4f1) ferromagnetism with a Tc = 6.6 K, a large positivemagnetoresistance reaching an MR of approximately 32 % below $T$ = 10 K, andstrongly correlated electrons, as evidenced by a Kadowaki-Woods ratio A/gamma^2close to known heavy fermion compounds. The here discovered material istherefore a promising model platform for the investigation of these entangledinteracting and potentially competing electronic states paired with complexcrystal chemistry.

A Heavy-Fermion Zn-deficient CaBe2Ge2-Type Phase with Rare Ce-based Ferromagnetism and Large Magnetoresistance