Magneto-conductive mechanisms in the La-site doped double-layered La1. 4Ca1. 6Mn2O7 manganites
Magneto-conductive mechanisms and properties of La 1.2 Re 0.2 Ca 1.6 Mn 2 O 7 (Re= La,
Pr, Y, Gd and Eu) have been investigated. In the low temperature range, combining residual
resistivity, weak localization effect, electron–electron and electron–phonon interactions in a
model, fit well the resistivity curves of undoped, Pr-doped and Y-doped samples. The Gd-
doped and Eu-doped ones require the introduction of the small polaron metallic conduction.
In the high temperature range, 3D-Mott's variable range hopping (3D-VRH) is the best model …
Pr, Y, Gd and Eu) have been investigated. In the low temperature range, combining residual
resistivity, weak localization effect, electron–electron and electron–phonon interactions in a
model, fit well the resistivity curves of undoped, Pr-doped and Y-doped samples. The Gd-
doped and Eu-doped ones require the introduction of the small polaron metallic conduction.
In the high temperature range, 3D-Mott's variable range hopping (3D-VRH) is the best model …
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