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arXiv 1107.0835cond-mat.str-el
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Sr $_2$ IrO $_4$和Ba $_2$ IrO $_4$中自旋轨道相互作用与库仑关联相互作用的{ \it Ab initio}研究

{\it Ab initio} Studies on the Interplay between Spin-Orbit Interaction and Coulomb Correlation in Sr$_2$IrO$_4$ and Ba$_2$IrO$_4$

R. Arita, J. Kuneš, A. V. Kozhevnikov, A. G. Eguiluz, M. Imada

摘要:

本文报道了A $_2$ IrO $_4$(A=Sr,Ba)的{\it Ab initio}分析。基于动力学平均场理论,求解了Ir 5 $d$ $t_{2g}$流形的有效Hubbard型模型. A=Sr和Ba的结果正确地再现了顺磁性金属在低于Néel温度$T_N$时连续转变为绝缘体的过程。这些化合物不属于莫特绝缘体,而属于斯莱特绝缘体。然而,绝缘间隙打开的Neel顺序和显着的带重正化的协同作用,这也表现为在量子临界附近的顺磁相的2D坏金属行为。

英文摘要:

{\it Ab initio} analyses of A$_2$IrO$_4$ (A=Sr, Ba) are presented. Effective Hubbard-type models for Ir 5$d$ $t_{2g}$ manifolds downfolded from the global band structure are solved based on the dynamical mean-field theory. The results for A=Sr and Ba correctly reproduce paramagnetic metals undergoing continuous transitions to insulators below the Néel temperature $T_N$. These compounds are classified not into Mott insulators but into Slater insulators. However, the insulating gap opens by a synergy of the Neel order and significant band renormalization, which is also manifested by a 2D bad metallic behavior in the paramagnetic phase near the quantum criticality.

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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