The effect of Cr substitution in a SrRuO 3 epitaxial thin film on SrTiO 3 substrate was investigated by measuring the magnetic and transport properties and the electronic states. The ferromagnetic transition temperature of the SrRu 0.9 Cr 0.1 O 3 film (166 K) was higher than that of the SrRuO 3 film (147 K). Resonant photoemission spectroscopy experimentally revealed that the Cr 3dt 2g orbital is hybridized with the Ru 4dt 2g orbital in the SrRu 0.9 Cr 0.1 O 3 film, supporting the assumption that the enhancement of the ferromagnetic transition temperature through Cr substitution stems from the widening of energy bands due to the hybridization of Cr 3dt 2g and Ru 4dt 2g orbitals.Furthermore, we found that the Hall resistivity of the SrRu 0.9 Cr 0.1 O 3 film at low temperature is not a linear function of magnetic field in the high-field region where the out-of-plane magnetization was saturated; this result suggests that the SrRu 0.9 Cr 0.1 O 3 film undergoes a structural transition at low temperature accompanied with the modulation of the Fermi surface.
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