Comment on ‘Resistivity Minimum Behavior and Weak Magnetic Disorder Characteristics in La2/3Ca1/3MnO3 Manganites’

Rozenberg, E.
February 2010
Journal of Superconductivity & Novel Magnetism;Feb2010, Vol. 23 Issue 2, p183
Academic Journal
In a recent paper (Chen et al. in J. Supercond. Nov. Magn. 22:465, ) Zhenping Chen et al. reported measurements of the electrical resistivity ( ρ) and magnetization versus temperature ( T) and magnetic field ( H) on polycrystalline manganite compound La2/3Ca1/3MnO3. In particular, the ρ( T) dependence shows a shallow minimum at Tmin∼20 K. Application of the external H up to 8 T leads to marked flattening of such minimum and to notable lowering of the Tmin on ρ( T, H) curves. The authors attributed this low-temperature anomaly to competitive quantum Kondo effect and three-dimensional electron–electron interaction, using the results of numerical fittings of ρ versus T and H dependences in the interval of about 5–30 K. It is suggested in the comment that such a claim seems to be doubtful due to the fundamental inapplicability of this approach for analysis of low-temperature conductivity in polycrystalline manganites. It is noted that a natural cause for both the low-temperature minimum on ρ( T) curve and its evolution upon magnetic field application, is the well-known grain boundary effect. The numerous uncertainties and obscurities are also characteristic for the paper being commented upon.


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