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首页> 外文期刊>IEEE Transactions on Magnetics >A Coexistence of Short- and Long-Range Ferromagnetic Interactions in La1–xKxMnO3 Compounds
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A Coexistence of Short- and Long-Range Ferromagnetic Interactions in La1–xKxMnO3 Compounds

机译：La 1–x K x MnO 3 化合物中短程和长程铁磁相互作用的共存

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摘要

In this paper, we present a detailed study on the critical behavior around the ferromagnetic (FM)-paramagnetic phase transition in La1-xKxMnO3 (LKMO) compounds with x = 0.05-0.20. Our results pointed out the easiness in controlling the value of TC from 212 to 306 K by increasing K-doping concentration (x) from 0.05 to 0.20. Analyzing temperature and magnetic field dependences of magnetization M(T, H) at temperatures around TC reveals all the samples undergoing the second-order phase transition. Using the modified Arrott plots, the Kouvel-Fisher, and the critical isotherm analysis methods, we have found that the values of exponent ß in the range of 0.435-0.493, which deviate from the mean-field theory (MFT) for the long-range FM interactions, indicating a coexistence of short- and long-range FM orders. We also pointed out that the critical exponents (ß and S) depend strongly on K-concentration, shifting from values approaching those of the MFT (ß = 0.5 and σ = 3) to values approaching those of the 3-D-Heisenberg model (ß = 0.365 and σ = 4.80). In contrast, the value of the exponent y (=1.222 - 1.249) is almost independent of K-concentration. It suggests that K-doping favors establishing a short-range FM order in LKMO compounds.
机译：在本文中，我们将对La 1-x K x MnO 3 < x = 0.05-0.20的（LKMO）化合物。我们的结果指出，通过将K掺杂浓度（x）从0.05增加到0.20，可以很容易地将TC值从212控制到306K。分析温度大约为TC时磁化强度M（T，H）的温度和磁场依赖性，发现所有样品都经历了二阶相变。使用修正的Arrott图，Kouvel-Fisher和临界等温线分析方法，我们发现指数ß的值在0.435-0.493的范围内，与长期的平均场理论（MFT）偏离范围FM交互，表明短期和远程FM订单并存。我们还指出，临界指数（ß和S）强烈依赖于K浓度，从接近MFT的值（ß= 0.5和σ= 3）转变为接近3-D-海森堡模型的值（ ß= 0.365，σ= 4.80）。相反，指数y的值（= 1.222-1.249）几乎与K浓度无关。这表明钾掺杂有助于在LKMO化合物中建立短程FM阶。

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