Tc suppression of SrRuO3/SrTiO3 superlattices

The transverse and longitudinal magnetoresistivities of SrRuO 3 /SrTiO 3 superlattices on SrTiO 3 (001) substrates were measured to study low-dimensional effects on the magnetic properties of SrRuO 3 . Both the differential resistivity, dp(T)/dT, and magnetoresistivity, Δρ(H) = ρ(H) - ρ(0), become maximum at the ferromagnetic transition temperature, T c . The transition appears when the SrRuO 3 layer is as thick as 2 unit-cells or more. The T c decreases quickly with decreasing thickness, especially for less than 4 unit-cell thickness.