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曹世勋

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期刊论文

Kondo-like transport and its correlation with the spin-glass phase in perovskite manganites

曹世勋Jincang Zhang Yan Xu Shixun Cao Guixin Cao Yufeng Zhang Chao Jing

PHYSICAL REVIEW B 72, 054410 (2005),-0001,():

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摘要/描述

A Kondo-like transport was observed in a metal-semiconductor transition (MSC) at low temperatures in the ferromagnetic metallic phase of the perovskite manganites. Experimental data can be best fitted in the framework of Kondo scattering, electron-electron (e-e), and electron-phonon (e-p) interaction. The results show that this behavior depends strongly on the content of the spin-glass phase and can be tuned with an applied magnetic field, which can be explained by the spin disorder scattering of electrons and/or antiferromagnetic cluster on a nanoscale and/or microscale, the interaction and strong correlation between electrons, and antiferromagnetic background. For the undoped samples, the MSC transition means the existence of intrinsic spin disorder with magnetic inhomogeneity. It is important that the present results give a direct evidence of Kondo scattering in ferromagnetic metallic manganites and prove that Kondo anomaly appears not only in metals containing small amounts of magnetic impurities but also in ferromagnetic conducting compounds containing spin-disorder clusters. This could be a general characteristic of the strongly correlated electron systems.

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【免责声明】以下全部内容由[曹世勋]上传于[2007年03月29日 11时07分38秒],版权归原创者所有。本文仅代表作者本人观点,与本网站无关。本网站对文中陈述、观点判断保持中立,不对所包含内容的准确性、可靠性或完整性提供任何明示或暗示的保证。请读者仅作参考,并请自行承担全部责任。

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