Materials with mixed valency that show a verwey transition
Materials with mixed valency that show a verwey transition
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DOI：
10.1080/01418638008221874
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发表时间：
1980-09
期刊：
影响因子：
--
通讯作者：
N. Mott
中科院分区：
文献类型：
--
作者：
N. Mott
本文讨论了Fe3O4和Ti4O7中Verwey转变的各种模型，以及Sm3S4中明显不存在的Verwey转变。在所有系统中都有极化子形成的证据，前两个系统中有双极化子形成的证据。尽管有极化子的形成，但在低温Fe3O4中，从Fe2+占据的位置到Fe3+占据的位置的波函数必然有相当大的重叠，因此，长程有序的消失将影响短程有序。
Abstract A discussion is given of various models for the Verwey transition in Fe3O4and Ti4O7, and its apparent absence in Sm3S4. In allsystems there is evidence for polaron formation, and for bipolarons in the first two. It is suggested that, in spite of polaron formation, in low-temperature Fe3O4 there must be considerable overlap of the wavefunction from the sites occupied by Fe2+onto those occupied by Fe3+, and that the disappearance of long-range order willtherefore affect short-range order.