Anomalies in electron spin resonance spectra of Ge1−xMnxTe diluted magnetic semiconductors
Anomalies in electron spin resonance spectra of Ge1−xMnxTe diluted magnetic semiconductors
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DOI：
10.1063/1.3504604
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发表时间：
2010-11
影响因子：
3.2
通讯作者：
E. Zvereva;O. Savelieva;A. Primenko;S. Ibragimov;E. Slynko;V. Slynko
中科院分区：
文献类型：
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作者：
E. Zvereva;O. Savelieva;A. Primenko;S. Ibragimov;E. Slynko;V. Slynko
我们报道了稀磁半导体Ge 1 −xMnxTe（x=0.07-0.44）的磁性和X-带电子自旋共振（ESR）研究（80-430 K），揭示了铁磁性，居里温度达到90 K。在0.15≤x≤0.26范围内，由居里常数估算的Mn ~（2+）离子的有效磁矩peff从2.27 μB增加到2.95 μB。ESR谱的温度演化具有复杂的特征。我们观察到存在两个不同的吸收线的戴森型，与两个共振中心在这些稀磁半导体。分析了这两条谱线的可能来源，并提出聚类效应是导致异常行为的最可能原因。在低于160 K的温度下观察到线宽和g因子的温度依赖性的异常。我们连接这些异常与磁波动附近的过渡到铁磁相。顺磁共振谱线宽度的异常增宽。
We report on magnetic properties and X-band electron spin resonance (ESR) study (80–430 K) of diluted magnetic semiconductors Ge1−xMnxTe (x=0.07–0.44) revealing ferromagnetism with the Curie temperature achieving 90 K. Effective magnetic moment peff per Mn2+ ion estimated from the Curie constant in the range 0.15≤x≤0.26 increases from 2.27 to 2.95 μB. The temperature evolution of ESR spectra was found to have a complicated character. We observed the presence of two distinct absorption lines of Dysonian type, associated with two resonance centers in these diluted magnetic semiconductors. Possible origin of these two lines has been analyzed and clustering effect was proposed to be most likely responsible for anomalous behavior. Anomalies in temperature dependencies of the linewidths and g-factors were observed at temperatures lower than 160 K. We connect these anomalies with magnetic fluctuations in the vicinity of transition to ferromagnetic phases. The anomalous broadening of the linewidth in paramagnetic...