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Local symmetry breaking for negatively charged impurity centers in SrTi_(1 - X) Mn _x O_3

机译:SrTi_(1-X)Mn _x O_3中带负电的杂质中心的局部对称性破裂

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摘要

First-principles calculations of the geometry and electronic structure of the impurity center in SrTi(1 - x) Mn _x O_3 have been performed. Neutral and negatively charged defects are considered. It is found that the doubly charged impurity center is polar; it has C _(4v) symmetry and electronic state ~4 B _1 with electron polaron localized at one of the neighboring titanium atoms. It is shown that this state is due to the spontaneous breaking of the defect local symmetry: O _h (~4 A _(1g)) → D _(4h) (~4 B _(1g)) → C _(4ν)(~4 B _1).
机译:已经对SrTi(1-x)Mn _x O_3中杂质中心的几何形状和电子结构进行了第一性原理计算。考虑中性和带负电荷的缺陷。发现双电荷杂质中心是极性的。它具有C _(4v)对称性和〜4 B _1电子态,电子极化子位于相邻的钛原子之一上。结果表明,这种状态是由于缺陷局部对称性的自发破坏引起的:O _h(〜4 A _(1g))→D _(4h)(〜4 B _(1g))→C _(4ν) (〜4 B _1)。

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