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arXiv 1302.4925cond-mat.str-elcond-mat.mtrl-sci
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掺杂诱导LaCoO3自旋态转变的动力学平均场研究

Doping Induced Spin State Transition in LaCoO3: Dynamical Mean-Field Study

P. Augustinsky, V. Krapek, J. Kunes

摘要:

用动态平均场论研究了空穴和电子掺杂的LaCoO 3。单粒子光谱进行了分析,并与现有的实验数据,特别是X射线吸收光谱。通过对时间自旋-自旋关联函数的分析,我们发现原子的中间自旋态对居里-外斯极化率的影响并不明显。与通常认为的t2 g和eg电子所扮演的角色相反,我们发现窄的t2 g准粒子带穿过费米能级,伴随着强烈的阻尼eg激发。

英文摘要:

Hole and electron doped LaCoO3 is studied using dynamical mean-field theory. The one-particle spectra are analyzed and compared to the available experimental data, in particular the x-ray absorption spectra. Analyzing the temporal spin-spin correlation functions we find the atomic intermediate spin state is not important for the observed Curie-Weiss susceptibility. Contrary to the commonly held view about the roles played by the t2g and eg electrons we find narrow quasiparticle bands of t2g character crossing the Fermi level accompanied by strongly damped eg excitations.

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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