ArXiv · 2026
Suppression and reemergence of directional transport across the ferromagnetic transition in SrRuO₃ ↗
SrRuO₃ is a canonical itinerant ferromagnet that continues to serve as a fertile platform for exploring spin-orbit coupled transport and topological responses in correlated oxide metals. Here, we investigate a (110)-oriented epitaxial SrRuO3 thin film on DyScO₃, where crystallographic anisotropy allows for symmetry-resolved charge transport along orthogonal in-plane directions. We uncover two principal findings. First, the resistance above the Curie temperature T_(c,on)≈ 165 K exhibits strong anisotropy, consistent with directionally dependent spin-fluctuation scattering. Below T_(c,on), this anisotropy nearly vanishes, despite persistent structural inequivalence, due to isotropic electron-magnon and electron-electron scattering processes. Second, the application of a magnetic field reveals a striking directional contrast in the linear magnetoresistance (MR): it remains negative and saturates along [001], but changes sign and becomes positive along [11̄0] below T₀=145 K. In contrast, the quadratic MR term is identical for both directions and peaks near T_OHE^*=155 K, where the ordinary Hall coefficient crosses zero, consistent with carrier compensation under a two-band scenario. A sign change in the anomalous Hall signal at T_AHE^*=150 K is consistent with a temperature-dependent redistribution of Berry-curvature contributions near the Fermi level. These results establish ferromagnetic ordering as the primary driver of the observed directional magnetotransport in SrRuO₃.
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