Magnetotransport in manganites and the role of quantal phases II: Experiment
Abstract
As in conventional ferromagnets, the Hall resistivity rhoxy of a La2/3(Ca,Pb)1/3MnO3 single crystal exhibits both ordinary and anomalous contributions at low temperature. However, these contributions, unexpectedly, have opposite signs. Near Tc, the ordinary contribution is no longer evident and rhoxy is solely determined by the sample magnetization, reaching an extremum at approximately 40% of the saturated magnetization. A new model for the anomalous Hall effect, incorporating the quantal phase accumulated by double-exchange, three-site hopping reproduces this result. Below Tc, rhoxy reflects the competition between normal and anomalous Hall effects.
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