Field dependence of colossal magnetoresistance in magnetic fields up to 50T
Field dependence of colossal magnetoresistance in magnetic fields up to 50T
复制标题
高达 50T 磁场中巨磁阻的场依赖性
DOI：
10.1016/j.jmmm.2004.11.488
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发表时间：
2005
影响因子：
2.7
通讯作者：
L. Schultz
中科院分区：
文献类型：
--
作者：
K. Dörr;K.-H. Müller;N. Kozlova;P. Reutler;R. Klingeler;B. Büchner;L. Schultz
在较宽的温度范围内，测量了La0.7Sr0.3MnO_3、La0.7Ca0.3MnO_3外延薄膜和La0.75Sr0.25MnO_3单晶的磁电阻(MR)。利用最近提出的布里渊定标模型对磁共振数据进行了分析。该模型很好地适用于顺磁态，实验结果证明了超顺磁团的存在。在铁磁有序温度附近，系统偏差，特别是在更大的场中，表明简单模型在那里是无效的。对于我们的样品，随温度变化的团簇尺寸参数相似，但与先前对半掺杂锰氧化物得到的团簇尺寸参数有本质的不同。
The magnetoresistance (MR) of La0.7Sr0.3MnO3and La0.7Ca0.3MnO3epitaxial films and of a La0.75Sr0.25MnO3single crystal were measured in pulsed magnetic fields up to 50T over a wide temperature range. MR data have been analysed utilizing the recently suggested Brillouin scaling model. The model applies well in the paramagnetic state, where results prove the presence of superparamagnetic clusters. Near the ferromagnetic ordering temperature, systematic deviations in particular in larger fields indicate that the simple model fails there. The temperature-dependent cluster size parameter is similar for our samples, but differs essentially from that obtained earlier for half-doped manganites.
基于有限脉冲响应滤波器的脉冲高场磁阻测量数字方法
影响因子：
2.7
作者：
N. Kozlova;M. Kozlov;D. Eckert;K. Müller;L. Schultz
通讯作者：
L. Schultz