Possible origin of orbital selective Mott transitions in iron-based superconductors and Ca2−xSrxRuO4

Possible origin of orbital selective Mott transitions in iron-based superconductors and Ca2−xSrxRuO4
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铁基超导体和 Ca2−xSrxRuO4 轨道选择性莫特跃迁的可能起源

DOI:
10.1088/1367-2630/17/3/033034
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发表时间:
2014-07
期刊:
News Journal of Physics
影响因子:
--
通讯作者:
Yu-ZhongZhang(张宇钟)
Yu-ZhongZhang(张宇钟)
中科院分区:
其他
文献类型:
--
作者:
Ze-YiSong;HunpyoLee;Yu-ZhongZhang(张宇钟)

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通过将动态平均场理论与零温下的精确对角化相结合,应用于一个半填充哈伯德模型,该模型中的两个轨道具有不同的非相互作用态密度。
By applying dynamical mean-field theory in combination with exact diagonalization at zero temperature to a half-filled Hubbard model with two orbitals having distinct noninteracting densities of states, we show that an orbital selective Mott transition (OSMT), where part of correlated itinerant electrons become localized, will take place even if the crystal field splitting, the differences in bandwidth, and orbital degeneracy are all absent. We find that not only decoupling of charge degrees of freedom between different orbitals, but also formation of local spin triplets are crucial for the appearance of such an OSMT. The relevance of our findings to the iron-based superconductors and Ca2−xSrxRuO4 is discussed, and a reasonable candidate to detect such an OSMT is proposed.
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