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The effect of Cr substitution in a SrRuO3 epitaxial thin film on SrTiO3substrate was investigated by measuring the magnetic and transport propertiesand the electronic states. The ferromagnetic transition temperature of theSrRu0.9Cr0.1O3 film (166 K) was higher than that of the SrRuO3 film (147 K).Resonant photoemission spectroscopy experimentally revealed that the Cr 3dt2gorbital is hybridized with the Ru 4dt2g orbital in the SrRu0.9Cr0.1O3 film,supporting the assumption that the enhancement of the ferromagnetic transitiontemperature through Cr substitution stems from the widening of energy bands dueto the hybridization of Cr 3dt2g and Ru 4dt2g orbitals. Furthermore, we foundthat the Hall resistivity of the SrRu0.9Cr0.1O3 film at low temperature is nota linear function of magnetic field in the high-field region where theout-of-plane magnetization was saturated; this result suggests that theSrRu0.9Cr0.1O3 film undergoes a structural transition at low temperatureaccompanied with the modulation of the Fermi surface.

Effects of Cr substitution on the magnetic and transport properties and electronic states of SrRuO3 epitaxial thin films