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I.Walha等人通过结构、磁性及电性能测定研究Ag置换La对La_(0.6)Ca_(0.4)Mn_2O_3化合物性能影响。X-射线衍射数据表明Ag置换并未引起结构变化。而磁化强度的温度依从性曲线表明,温度升高时所有试样都发生铁磁性向顺磁性转变。出现了Tp1和Tp2两种转变,后者是电荷有序化(CO)效应的异常效应。随外加磁场增强,磁阻(MR)增大;随Ag置换量增加,磁阻减小。常温下,当外加磁场8T时,Ag置换La和未
I. Walha et al. Investigated the effect of Ag substitution La on the properties of La_ (0.6) Ca_ (0.4) Mn_2O_3 via structure, magnetic and electrical properties. X-ray diffraction data showed that Ag substitution did not cause structural changes. The temperature dependence of magnetization shows that the ferromagnetic to paramagnetic transitions occur in all the samples at elevated temperature. Two transitions, Tp1 and Tp2, appear, the latter being an anomalous effect of the charge-ordering (CO) effect. With the increase of the applied magnetic field, the reluctance (MR) increases; as the amount of Ag substitution increases, the reluctance decreases. At room temperature, when the applied magnetic field 8T, Ag replacement La and not