In-plane Hall effect in c-axis-oriented MgB2 thin films

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We have measured the longitudinal resistivity and the Hall resistivity in the ab-plane of highly c-axis-oriented MgB2 thin films. In the normal state, the Hall coefficient (Rₕ) behaves as Rₕ T with increasing temperature (T) up to 130 K and then deviates from that linear T-dependence at higher temperatures. The T² dependence of the cotangent of the Hall angle is only observed above 130 K. The mixed-state Hall effect reveals no sign anomaly over a wide range of current densities from 10² to 10⁴ A/cm² and for magnetic fields up to 5 T.