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Comparison of electronic structures of orthorhombic and hexagonal manganites studied by X-ray absorption spectroscopy

机译:X射线吸收光谱法研究正交晶和六方锰矿的电子结构

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Electronic structures of orthorhombic perovskite-type manganites (OM) and hexagonal manganites (HM) are compared by using X-ray absorption near edge structure spectroscopy. This study reveals that the environments around Mn and O ions in both the systems are different. These are reflected primarily in the lifting of degeneracy of the Mn 3d orbitals. Interestingly, the unoccupied Mn 3d(x)(-y)(2)(2) orbital in HM is strongly hybridized with O 2p states and appears to be responsible for both long range orderings: ferroelectnic ordering at high temperatures and ferromagnetic ordering at low temperatures. (c) 2005 Elsevier Ltd. All rights reserved.
机译:正交晶钙钛矿型锰矿(OM)和六角型锰矿(HM)的电子结构通过使用近边缘结构的X射线吸收光谱进行了比较。这项研究表明,两个系统中Mn和O离子周围的环境是不同的。这些主要反映在Mn 3d轨道简并性的解除上。有趣的是,HM中未占据的Mn 3d(x)(-y)(2)(2)轨道与O 2p态高度杂化,似乎与两种长程有序有关:高温下的铁电有序和低温下的铁磁有序温度。 (c)2005 Elsevier Ltd.保留所有权利。

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