Hall effect of La{sub 2/3}(Ca,Pb){sub 1/3}MnO{sub 3} single crystals near the critical temperature
- Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080 (United States)
The Hall resistivity {rho}{sub xy} of a La{sub 2/3}(Ca,Pb){sub 1/3}MnO{sub 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}{sub xy} is positive and linear in field, indicating that the anomalous contribution R{sub S} is negligible. However, the effective carrier density in a free electron model is n{sub eff}=2.4 holes/Mn, even larger than the 0.85{endash}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}{sub xy} appears, that we ascribe to R{sub S}. Using detailed magnetization data, we separate the ordinary ({proportional_to}B) and anomalous ({proportional_to}M) contributions. Below T{sub c}, {vert_bar}R{sub S}{vert_bar}{proportional_to}{rho}{sub 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}{sub xy}/{rho}{sub 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 the two-fluid model is also presented. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 337542
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 59, Issue 17; Other Information: PBD: May 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mixed-state Hall-effect studies in high-{ital T}{sub {ital c}}-superconducting (YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}){sub {ital n}}/(PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}){sub {ital m}} superlattices
Hall effect and flux dynamics in YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} multilayers in the mixed state