Magnetically driven electronic phase separation in the semimetallic ferromagnet EuB6
Magnetically driven electronic phase separation in the semimetallic ferromagnet EuB6
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DOI：
10.1103/physrevb.86.184425
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发表时间：
2012-04
影响因子：
3.7
通讯作者：
P. Das;A. Amyan;J. Brandenburrg;J. Muller;P. Xiong;S. V. Moln'ar;Z. Fisk
中科院分区：
文献类型：
--
作者：
P. Das;A. Amyan;J. Brandenburrg;J. Muller;P. Xiong;S. V. Moln'ar;Z. Fisk
作者：Das，P; Amyan，A;勃兰登堡，J; Muller，J; Xiong，P; Von Molnar，S;菲斯克，Z|摘要：结合测量的波动光谱和弱非线性传输的半金属铁磁体EuB 6揭示明确的证据磁驱动的电子相分离的磁极化子（MP），形成高导电磁有序的集群在顺磁性和“导电性差”的背景渗透的图片相一致。这些不同部分的导电网络分别探测的噪声光谱/非线性传输和传统的线性电阻率。我们提出了一个全面的和“普遍”的情况下，MP渗流，这发生在临界磁化诱导的铁磁秩序在零场或外部施加的磁场在顺磁区。© 2012美国物理学会。
Author(s): Das, P; Amyan, A; Brandenburg, J; Muller, J; Xiong, P; Von Molnar, S; Fisk, Z | Abstract: Combined measurements of fluctuation spectroscopy and weak nonlinear transport of the semimetallic ferromagnet EuB 6 reveal unambiguous evidence for magnetically driven electronic phase separation consistent with the picture of percolation of magnetic polarons (MP), which form highly conducting magnetically ordered clusters in a paramagnetic and "poorly conducting" background. These different parts of the conducting network are probed separately by the noise spectroscopy/nonlinear transport and the conventional linear resistivity. We suggest a comprehensive and "universal" scenario for the MP percolation, which occurs at a critical magnetization either induced by ferromagnetic order at zero field or externally applied magnetic fields in the paramagnetic region. © 2012 American Physical Society.