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arXiv 0907.0743cond-mat.str-elcond-mat.mtrl-sci
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Na $_{2}$ IrO $_{3}$的Mott绝缘基态及其与自旋轨道绝缘体的接近

Mott Insulating Ground State and its Proximity to Spin-Orbit Insulators in Na$_{2}$IrO$_{3}$

Hosub Jin, Heungsik Kim, Hogyun Jeong, Choong H. Kim, Jaejun Yu

摘要:

基于密度泛函理论计算,考虑自旋轨道耦合和在位库仑相互作用$U$,我们提出了Na $_{2}$ IrO $_{3}$的反铁磁有序基态.研究表明,$e_{g}'$的强自旋-轨道耦合对$e_{g}'$双态的分裂是导致其绝缘带隙和磁性基态的主要原因。由于其接近的自旋轨道绝缘体相,磁有序与有限的$U$得到的被发现表现出很强的面内各向异性。Na $_{2}$ IrO $_{3}$的相图表明自旋轨道绝缘体和Mott反铁磁绝缘体相之间可能存在相互作用。

英文摘要:

We present an anti-ferromagnetically ordered ground state of Na$_{2}$IrO$_{3}$ based on density-functional-theory calculations including both spin-orbit coupling and on-site Coulomb interaction $U$. We show that the splitting of $e_{g}'$ doublet states by the strong spin-orbit coupling is mainly responsible for the intriguing nature of its insulating gap and magnetic ground state. Due to its proximity to the spin-orbit insulator phase, the magnetic ordering as obtained with finite $U$ is found to exhibit a strong in-plane anisotropy. The phase diagram of Na$_{2}$IrO$_{3}$ suggests a possible interplay between spin-orbit insulator and Mott anti-ferromagnetic insulator phases.

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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