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[資源]
2013 Nature materials 上的一篇關(guān)于 鐵電金屬 的最新發(fā)現(xiàn)
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早在1965年就曾有人預(yù)言鐵電金屬的存在--金屬態(tài)內(nèi)可以發(fā)生類鐵電相轉(zhuǎn)變。但是在過去的幾十年,一直都還沒有關(guān)于鐵電金屬的報(bào)道。 A ferroelectric-like structural transition in a metal 該文章報(bào)道了一種不同于傳統(tǒng)金屬材料的類鐵電金屬 Metals cannot exhibit ferroelectricity because static internal electric fields are screened by conduction electrons 1 , but in 1965, Anderson and Blount predicted the possibility of a ferroelectric metal, in which a ferroelectric-like structural transition occurs in the metallic state 2 . Up to now, no clear example of such a material has been identified. Here we report on a centrosymmetric (Rˉ3c) to non-centrosymmetric (R3c) transition in metallic LiOsO 3 that is structurally equivalent to the ferroelectric transition of LiNbO 3 (ref. 3). The transition involves a continuous shift in the mean position of Li + ions on cooling below 140 K. Its discovery realizes the scenario described in ref. 2, and establishes a new class of materials whose properties may differ from those of normal metals. |
文獻(xiàn)推薦 | 鐵電鐵性多鐵材料 | 物理材料類 |
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