Fig. 6
(a) Hall coefficient measured in multiple magnetic fields applied perpendicular to the ab planes of the Bi-2212 thin film (sample B). The inset provides a magnified view to emphasize the sign reversal of the Hall effect. (b) Normalized Hall conductivity \(\sigma _{xy}/B\) as a function of temperature under various magnetic fields. The grey dashed line illustrates a \(T^{-2}\) dependence of the normal-state \(\sigma _{xy}/B\). Inset: Detailed view of the Hall effect sign change.
