The observed H2 and |H| dependence of the magnetoresistance above and below TC, respectively, may be explained by general time‐reversal symmetry considerations. We further find empirically that the saturation observed in the magnetoresistance is best fit by a simple resistor in series with a magnetoconductor: ρ(H)=ρ∞+1/(σ0+γ|H|) for T<Tc and ρ(H)=ρ∞+1/(σ0+βH2) for T>TC. This provides a functional form to analyze and predict the magnetoresistance over a wide range of fields. This suggests that the underlying mechanism of ‘‘colossal magnetoresistance ’’ may be magnetoconductive, not magnetoresistive. The magnetoresistance and Hall effects on an annealed epitaxial thin films of La0.67Ca0.33MnO3 were measured at 0.9 TC and 1.1 TC. At low fields, anisotropic magnetoresistance plays a dominant role. The high field Hall effect shows holelike carriers above and below TC. The apparent change in sign at low fields is likely due to the anomalous Hall effect.
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30 December 1996
Research Article|
December 30 1996
Magnetoconductivity and Hall effects in La0.67Ca0.33MnO3 Available to Purchase
G. Jeffrey Snyder;
G. Jeffrey Snyder
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
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M. R. Beasley;
M. R. Beasley
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
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T. H. Geballe;
T. H. Geballe
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
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Ron Hiskes;
Ron Hiskes
Hewlett‐Packard, Palo Alto, California 94303‐0867
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Steve DiCarolis
Steve DiCarolis
Hewlett‐Packard, Palo Alto, California 94303‐0867
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G. Jeffrey Snyder
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
M. R. Beasley
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
T. H. Geballe
Department of Applied Physics, Stanford University, Stanford, California 94305‐4090
Ron Hiskes
Hewlett‐Packard, Palo Alto, California 94303‐0867
Steve DiCarolis
Hewlett‐Packard, Palo Alto, California 94303‐0867
Appl. Phys. Lett. 69, 4254–4256 (1996)
Article history
Received:
August 15 1996
Accepted:
October 25 1996
Citation
G. Jeffrey Snyder, M. R. Beasley, T. H. Geballe, Ron Hiskes, Steve DiCarolis; Magnetoconductivity and Hall effects in La0.67Ca0.33MnO3. Appl. Phys. Lett. 30 December 1996; 69 (27): 4254–4256. https://doi.org/10.1063/1.116962
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