Abstract
The influence of Nd doping on the charge ordering (CO) state of polycrystalline (La1−zNdz)Sr2Mn2O7 (z = 0, 0.2, 0.5, 0.7, 1) is investigated by magnetic and electric transport property measurements. The temperature dependence of the resistivity of all samples shows the formation of the CO state at above 200 K and the re-entrant-type CO state exists only when z ≤ 0.7. The result of magnetization measurements shows that all samples exhibit an antiferromagnetic (AFM) transition accompanying the existence of the CO state at TCO. Double peaks of the M(T) curve are observed for heavily doped samples with z ≥ 0.5 due to the disorder of the Nd doping. The transport mechanism of all the samples is also discussed. (© 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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