Correlation among magneto-, electrical- and thermal-transport properties in SrRuO 3 films

The magneto-, electrical- and thermal-transport properties of SrRuO 3 (SRO) films have been investigated. The magnetization ( M ), relative resistivity (Δ ρ ) and relative Seebeck (Δ S ) near T C follow a scaling law, M ~ ( T C − T ) α , Δρ SP ~ ( T − T ) 2 β and ΔS ~ ( T C − T ) 2 γ , respectively. The values α = 0.394, β = 0.401 and γ = 0.421 for the (001)-SRO thin films are well fitted with mean-field critical exponents. While critical exponent α = 0.365, β = 0.357 and γ = 0.363 for the (111)-SRO thin films belong to Heisenberg ferromagnetic behavior. A T 2 temperature dependence of resistivity below 30 K corresponds to a Fermi-liquid state. In the Fermi-liquid regime, the MR(%) =| ρ (H)− ρ (0)|/ ρ (0) × 100% and MS(%) =| S (H)− S (0)|/ S (0) × 100% are quadratic at low field and almost linear for large field without saturation until 70 kOe. Furthermore, d M /d T , d ρ /d T and d S /d T show a linear relationship, indicating the intrinsic electrical-, thermal- and magneto-transport properties are coupled.