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Title: Comment on “Magnetic field mediated low-temperature resistivity upturn in electron-doped La{sub 1−x}Hf{sub x}MnO{sub 3} manganite oxides” [J. Appl. Phys. 112, 123710 (2012)]

In a recent paper, Guo et al. [J. Appl. Phys. 112, 123710 (2012)] reported on characteristic features of the temperature (T) and magnetic field (H) dependences of electrical resistivity (ρ) in polycrystalline La{sub 1−x}Hf{sub x}MnO{sub 3} (x = 0.2 and 0.3) manganites. In particular, shallow minima were observed at some T{sub min} below 100 K on ρ(T) curves. Application of an external H ≤ 5 T leads first to a decrease in the T{sub min} value, while this value increases notably at H > 0.75 T. The authors attributed this complex behavior to competitive electron-electron interaction and Kondo-like spin dependent scattering of carriers. It is shown in the comment that such interpretation is very questionable due to the fundamental inapplicability of this approach for analysis of low-T conductivity in polycrystalline manganites. It seems that the most likely reason for the appearance of the low temperature minima on ρ(T) curves and their evolution upon field application is the well known grain boundary effects in magnetically and structurally inhomogeneous samples.
Authors:
 [1]
  1. Department of Physics, Ben-Gurion University of the Negev, POB 653, 84105 Beer-Sheva (Israel)
Publication Date:
OSTI Identifier:
22275753
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRON-ELECTRON COUPLING; ELECTRONS; GRAIN BOUNDARIES; HAFNIUM COMPOUNDS; LANTHANUM COMPOUNDS; MAGNETIC FIELDS; MANGANATES; POLYCRYSTALS; SPIN; TEMPERATURE DEPENDENCE