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arXiv 1105.5664cond-mat.mtrl-scicond-mat.str-el
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镍中本征反常霍尔效应的温度特性

Temperature Dependence of the Intrinsic Anomalous Hall Effect in Nickel

Li Ye, Yuan Tian, Di Xiao, Xiaofeng Jin

摘要:

我们研究了Ni中反常霍尔效应的温度依赖性。通过改变MBE生长的Ni膜的厚度,纵向电阻率被唯一地调谐而不诉诸掺杂杂质;因此,本征和非本征贡献被干净地分离出来。与其他铁磁体(如Fe)形成鲜明对比的是,发现Ni中的本征贡献与温度密切相关,低温下的值为1100(ohm*cm)^(-1),高温下为500(ohm*cm)^(-1)。这种明显的温度依赖性是AHE的物理起源长期存在的混乱的一个原因,可能是由于靠近费米面的自旋轨道耦合引起的小能级分裂。我们的结果有助于为AHE的贝里相解释的一般主张铺平道路。

英文摘要:

We investigate the unusual temperature dependence of the anomalous Hall effect in Ni. By varying the thickness of the MBE-grown Ni films, the longitudinal resistivity is uniquely tuned without resorting to doping impurities; consequently, the intrinsic and extrinsic contributions are cleanly separated out. In stark contrast to other ferromagnets such as Fe, the intrinsic contribution in Ni is found to be strongly temperature dependent with a value of 1100 (ohm*cm)^(-1) at low temperatures and 500 (ohm*cm)^(-1) at high temperatures. This pronounced temperature dependence, a cause of long-standing confusion concerning the physical origin of the AHE, is likely due to the small energy level splitting caused by the spin orbit coupling close to the Fermi surface. Our result helps pave the way for the general claim of the Berry-phase interpretation for the AHE.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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