Hall Effect of La2/3(Ca,Pb)1/3MnO3 Single Crystals near the Critical Temperature

Details Hall Effect of La2/3(Ca,Pb)1/3MnO3 Single Crystals near the Critical Temperature Hall Effect of La2/3(Ca,Pb)1/3MnO3 Single Crystals near the Critical Temperature

1998-10-30

arxiv.org/abs/cond-mat/9810410v1

Phys. Rev. B 59, 11155 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

revtex, 11 pages, 4 figures

Scientific paper

10.1103/PhysRevB.59.11155

The Hall resistivity rho_{xy} of a La_{2/3}(Ca,Pb)_{1/3}MnO_3 single crystal has been measured as a function of temperature and field. The overall behavior is similar to that observed previously in thin-films. At 5 K, rho_{xy} is positive and linear in field, indicating that the anomalous contribution $R_S$ is negligible. However, the effective carrier density in a free electron model is n_{eff}=2.4 holes/Mn, even larger than the 0.85-1.9 holes/Mn reported for thin-films and far larger than the 0.33 holes/Mn expected from the doping level. As temperature increases, a strong, negative contribution to rho_{xy} appears, that we ascribe to R_S. Using detailed magnetization data, we separate the ordinary (\propto B) and anomalous (\propto M) contributions. Below T_C, R_S \propto rho_{xx}, indicating that magnetic skew scattering is the dominant mechanism in the metallic ferromagnetic regime. At and above the resistivity-peak temperature, we find that rho_{xy}/rho_{xx}M is a constant, independent of temperature and field. This implies that the anomalous Hall coefficient is proportional to the magnetoresistance. A different explanation based on two fluid model is also presented.

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