论文标题
轨道选择性耦合在cerh $ _3 $ b $ _2 $：高居里和高近东温度的共存
Orbital selective coupling in CeRh$_3$B$_2$: co-existence of high Curie and high Kondo temperature
论文作者
论文摘要
We investigated the electronic structure of the enigmatic CeRh$_3$B$_2$ using resonant inelastic scattering and x-ray absorption spectroscopy in combination with $ab$ $initio$ density functional calculations.我们发现Rh 4 $ d $状态与高温铁磁和近藤效应无关。我们还发现，CE 4 $ F $晶体场强度太小，无法解释CE磁矩的强大减少。该数据揭示了两个不同的活动CE 4 $ F $轨道的存在，每个耦合选择性地与CERH $ _3 $ b $ _2 $中的不同频段耦合。 | j = 5/2，jz =+/ - 1/2>水晶状态和ce 5 $ d $ band的位置间杂交结合了内部站点CE 4 $ f $ -5 $ d $交换产生了强大的铁磁剂，而| j = 5/2，jz =+/-2 $ b $ $ b $ b $导致减少力矩。这种轨道选择性耦合解释了CERH $ _3 $ b $ _2 $的独特且看似矛盾的属性。
We investigated the electronic structure of the enigmatic CeRh$_3$B$_2$ using resonant inelastic scattering and x-ray absorption spectroscopy in combination with $ab$ $initio$ density functional calculations. We find that the Rh 4$d$ states are irrelevant for the high-temperature ferromagnetism and the Kondo effect. We also find that the Ce 4$f$ crystal-field strength is too small to explain the strong reduction of the Ce magnetic moment. The data reveal instead the presence of two different active Ce 4$f$ orbitals, with each coupling selectively to different bands in CeRh$_3$B$_2$. The inter-site hybridization of the |J=5/2,Jz=+/-1/2> crystal-field state and Ce 5$d$ band combined with the intra-site Ce 4$f$-5$d$ exchange creates the strong ferromagnetism, while hybridization between the |J=5/2,Jz=+/-5/2> and the B $sp$ in the $ab$-plane contributes to the Kondo interaction which causes the moment reduction. This orbital selective coupling explains the unique and seemingly contradictory properties of CeRh$_3$B$_2$.
