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The ferromagnetic (FM) quantum phase transition in the perovskite ruthenate Sr 1− x  Ca  x  RuO 3  is studied by low‐temperature magnetization and electrical resistivity measurements on thin films. The films were grown epitaxially on SrTiO 3  substrates using metalorganic aerosol deposition and characterized by X‐ray diffraction and room temperature scanning tunneling microscopy. High residual resistivity ratios of 29 and 16 for  $x = 0$  and  $1$ , respectively, prove the high quality of the investigated samples. We observe a continuous suppression of the FM Curie temperature from  $T_{\rm C} = 160\,{\rm K}$  at  $x = 0$  towards  $T_{\rm C} \to 0$  at  $x_{\rm c} \approx 0.8$ . The analysis of the electrical resistivity between 2 and 10 K reveals  T  2  and  T  3/2  behavior at  $x \leq 0.6$  and  $x \geq 0.7$ , respectively. For undoped CaRuO 3 , the measurement has been extended down to 60 mK, revealing a crossover to  T  2  behavior around 2 K, which suggests a Fermi‐liquid ground state in this system.

Ferromagnetic quantum phase transition in Sr 1− x Ca x RuO 3 thin films