Magnetotransport in manganites and the role of quantal phases II: Experiment

Details Magnetotransport in manganites and the role of quantal phases II: Experiment Magnetotransport in manganites and the role of quantal phases II: Experiment

1999-04-22

arxiv.org/abs/cond-mat/9904332v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, Companion Letter cond-mat/9904331

Scientific paper

10.1103/PhysRevLett.84.757

As in conventional ferromagnets, the Hall resistivity rho_xy of a La_{2/3}(Ca,Pb)_{1/3}MnO_3 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 rho_xy 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, rho_xy reflects the competition between normal and anomalous Hall effects.

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