Magnetism and the Trimeron Bond.
Magnetism and the Trimeron Bond.
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DOI：
10.1021/acs.chemmater.2c00275
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发表时间：
2022-04-12
影响因子：
8.6
通讯作者：
Attfield, J. Paul
中科院分区：
文献类型：
--
作者：
Attfield, J. Paul
综述了近十年来磁铁矿（Fe_3O_4）中Verwey相变的研究进展。1939年报道了这种电子和结构在125 K的转变，此后一直是磁学中有争议的问题。从晶体结构的精细化可以看出，在相变点以下，Fe ~（2+）/Fe ~（3+）的长程电荷有序得到了证实，Fe ~（2+）的轨道有序以及Fe ~（2+）与相邻两个Fe ~（2+）的弱键合形成了三聚体。这个模型已经解释了许多光谱观测，如57 Fe NMR频率。测量了三重子的寿命，观察到了三重子的软模。纳米粒子研究揭示了掺杂磁铁矿中Verwey跃迁的一阶到二阶交叉的起源。电子和结构的波动被发现坚持到温度远高于电视和本地结构扭曲跟踪体磁化，消失在850 K居里转变。在高压下发现的新的二元混合价铁氧化物具有与磁铁矿相似的电子跃迁和轨道分子基态。
A review of progress in understanding the Verwey transition in magnetite (Fe3O4) over the past decade is presented. This electronic and structural transition at TV ≈ 125 K was reported in 1939 and has since been a contentious issue in magnetism. Long range Fe2+/Fe3+ charge ordering has been confirmed below the transition from crystal structure refinement, and Fe2+ orbital ordering and formation of trimerons through weak bonding of Fe2+ states to two Fe neighbors has been discovered. This model has accounted for many spectroscopic observations such as the 57Fe NMR frequencies. The trimeron lifetime has been measured, and trimeron soft modes have been observed. The origin of the first to second order crossover of Verwey transitions in doped magnetites has been revealed by a nanoparticle study. Electronic and structural fluctuations are found to persist to temperatures far above TV and local structural distortions track the bulk magnetization, disappearing at the 850 K Curie transition. New binary mixed-valent iron oxides discovered at high pressure are found to have electronic transitions and orbital molecule ground states similar to those of magnetite.
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影响因子：
16.6
作者：
Hong KH;Arevalo-Lopez AM;Cumby J;Ritter C;Attfield JP
通讯作者：
Attfield JP
影响因子：
3.3
作者：
Borroni, S.;Tucker, G. S.;Carbone, F.
通讯作者：
Carbone, F.
影响因子：
12.5
作者：
Bosak, Alexey;Chernyshov, Dmitry;Parlinski, Krzysztof
通讯作者：
Parlinski, Krzysztof
影响因子：
16.6
作者：
Cassidy, Simon J.;Orlandi, Fabio;Clarke, Simon J.
通讯作者：
Clarke, Simon J.
影响因子：
5.3
作者：
Coe, Robert S.;Egli, Ramon;Wright, Jonathon P.
通讯作者：
Wright, Jonathon P.