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首页> 外文期刊>Physica status solidi, B. Basic research >Effects of quenched disorder on Griffiths phase and EPR line width in La0.67-2xNd2xCa0.33-xSrxMnO3 manganites
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Effects of quenched disorder on Griffiths phase and EPR line width in La0.67-2xNd2xCa0.33-xSrxMnO3 manganites

机译:淬火对La0.67-2xNd2xCa0.33-xSrxMnO3锰矿的格里菲斯相和EPR线宽的影响

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摘要

It is widely accepted that there is Griffiths phase (GP) present in the paramagnetic phase in doped manganites. We studied the effect of quenched disorder on the region of GP in connection with the temperature dependence of the line width (Delta H) of the electron paramagnetic resonance (EPR) in La0.67-2xNd2xCa0.33-xSrxMnO3 (x = 0, 0.1, 0.15, 0.2 and 0.25). With this approach it is found that Delta H(T), the minimum in the line width (Delta H-min) and T-min are reproduced. With increasing values of the quenched disorder the values of Delta H-min are found to increase. A numerical relation that correlates the temperature range in which GP exists and the cation size disorder is obtained and found to be in agreement with some reported data. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
机译:人们普遍认为,在掺杂的锰铁矿的顺磁相中存在格里菲斯相(GP)。我们研究了La0.67-2xNd2xCa0.33-xSrxMnO3(x = 0,0.1)中电子顺磁共振(EPR)的线宽(Delta H)的温度依赖性对淬灭无序对GP区域的影响,0.15、0.2和0.25)。通过这种方法,发现再现了线宽(Delta H-min)和T-min中的最小值的Delta H(T)。随着淬火障碍值的增加,发现ΔH-min的值增加。获得了与GP存在的温度范围和阳离子尺寸紊乱相关的数值关系,并且发现该数值关系与某些报道的数据相符。 (C)2008 WILEY-VCH Verlag GmbH&Co. KGaA,Weinheim。

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