Magnetically driven electronic phase separation in the semimetallic ferromagnet EuB6

Article

关键词: 1/F NOISE;    PERCOLATION-THRESHOLD;    NONLINEAR BEHAVIOR;    TRANSPORT;    ORDER;    MAGNETORESISTANCE;    CONDUCTIVITY;    COMPOSITES;    EXPONENTS;    NETWORKS;   

DOI  :  10.1103/PhysRevB.86.184425

来源: SCIE

【 摘 要 】

Combined measurements of fluctuation spectroscopy and weak nonlinear transport of the semimetallic ferromagnet EuB6 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 appliedmagnetic fields in the paramagnetic region.

【 授权许可】

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