Enhanced atomic-scale contrast on Fe3O4 (100) observed with an Fe STM tip
Enhanced atomic-scale contrast on Fe3O4 (100) observed with an Fe STM tip
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使用 Fe STM 针尖观察到 Fe3O4 (100) 的原子尺度对比度增强
DOI：
10.1007/s003390100739
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
V. Brabers
中科院分区：
文献类型：
--
作者：
R. Koltun;M. Herrmann;G. Güntherodt;V. Brabers
用电流脉冲在扫描隧道显微镜中原位制备了纯净的合成磁铁矿(Fe3O4)单晶的(100)面，而不需要后续的退火。我们已经观察到了原子分辨梯田，其中含有B-亚晶格(八面体配位晶格)中的Fe2+和Fe3+离子。在300K下，使用原位制备的Fe隧道尖端，观察到了沿这些行的长距离波纹(∼12á)。这种波纹被解释为与顶部表层300℃以上的Verwey跃迁有关的Wigner局部化。
Abstract.Clean (100) surfaces of a synthetic single crystal of magnetite (Fe3O4) have been prepared in situ using current pulses in a scanning tunneling microscope without subsequent annealing. We have observed atomically resolved terraces with rows of Fe2+ and Fe3+ ions of the B-sublattice (octahedrally coordinated lattice sites). Along these rows a long-distance corrugation (∼12 Å) has been observed at 300 K using in situ prepared Fe tunneling tips. This corrugation is interpreted as a Wigner localization associated with a Verwey transition above 300 K in the top surface layer.