Abstract
The magnetic and magnetotransport properties of SrRuO3 epitaxial thin films grown on (001)-oriented SrTiO3 substrates by dc magnetron sputtering were studied in detail. The analysis of the electric transport data suggests a crossover from Fermi-liquid to non-Fermi-liquid behavior at ∼50K. Apart from this, a low-temperature upturn in the resistivity of the film is observed which is possibly associated with disorder-induced localization effects. Interestingly, the ρ(T) in the paramagnetic state follows a T1/2 dependence. This behavior is similar to that observed in bulk SRO single-crystals. Most strikingly, the temperature-dependent magnetoresistance exhibits two distinct dips (one around ferromagnetic ordering temperature and the other around 40K), resembling a double-well potential in appearance. Concerning the magnetic behavior of the films, it is found that the low-temperature magnetization diminishes with increasing temperature due, probably, to thermally excited magnons as well as Stoner excitations. In turn, the magnetization near TC follows the scaling law, M∞(TC−T)α, with α≈0.39. The magnitude of α seems to be consistent with three-dimensional (3D) Ising-type ferromagnetic behavior.
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