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arXiv 0810.4905cond-mat.str-elcond-mat.mtrl-sci
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过渡金属氧化物ARPES光谱的系统紧束缚分析

Systematic tight-binding analysis of ARPES spectra of transition-metal oxides

H. Wadati, A. Chikamatsu, M. Takizawa, H. Kumigashira, T. Yoshida, T. Mizokawa, A. Fujimori, M. Oshima, N. Hamada

摘要:

我们进行了系统的紧束缚(TB)分析的角度分辨光电子能谱(ARPES)光谱的过渡金属(TM)氧化物A $M$ O $_3$($M=$ Ti,V,Mn,和Fe)的钙钛矿型结构,并比较所获得的参数与从组态相互作用(CI)团簇模型分析的光电子能谱。从ARPES的$ε_d-ε_p$的值被发现是类似于从O $2p$轨道到空TM 3d轨道的电荷转移能量$Δ$和远大于$Δ-U/2$($U$:现场库仑能量)预期的Mott-Hubbard型化合物,包括SrVO $_3$。从{ \it ab initio}能带结构计算得到的$ε_d-ε_p$值显示出与ARPES相似的行为。的值的$p-d$转移积分来描述的全球电子结构被发现是相似的,在所有的估计,而额外的缩小超出TB的描述发生在ARPES谱的$d$频带。

英文摘要:

We have performed systematic tight-binding (TB) analyses of the angle-resolved photoemission spectroscopy (ARPES) spectra of transition-metal (TM) oxides A$M$O$_3$ ($M=$ Ti, V, Mn, and Fe) with the perovskite-type structure and compared the obtained parameters with those obtained from configuration-interaction (CI) cluster-model analyses of photoemission spectra. The values of $ε_d-ε_p$ from ARPES are found to be similar to the charge-transfer energy $Δ$ from O $2p$ orbitals to empty TM 3d orbitals and much larger than $Δ-U/2$ ($U$: on-site Coulomb energy) expected for Mott-Hubbard-type compounds including SrVO$_3$. $ε_d-ε_p$ values from {\it ab initio} band-structure calculations show similar behaviors to those from ARPES. The values of the $p-d$ transfer integrals to describe the global electronic structure are found to be similar in all the estimates, whereas additional narrowing beyond the TB description occurs in the ARPES spectra of the $d$ band.

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