Leedahl Brett, Sundermann Martin, Amorese Andrea, Severing Andrea, Gretarsson Hlynur, Zhang Lunyong, Komarek Alexander C, Maignan Antoine, Haverkort Maurits W, Tjeng Liu Hao
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany.
Institute of Physics II, University of Cologne, Zülpicher Straße 77, 50937, Cologne, Germany.
Nat Commun. 2019 Nov 29;10(1):5447. doi: 10.1038/s41467-019-13273-4.
The one-dimensional cobaltate Ca[Formula: see text]Co[Formula: see text]O[Formula: see text] is an intriguing material having an unconventional magnetic structure, displaying quantum tunneling phenomena in its magnetization. Using a newly developed experimental method, [Formula: see text]-core-level non-resonant inelastic x-ray scattering ([Formula: see text]-NIXS), we were able to image the atomic Co [Formula: see text] orbital that is responsible for the Ising magnetism in this system. We can directly observe that corrections to the commonly accepted ideal prismatic trigonal crystal field scheme occur in Ca[Formula: see text]Co[Formula: see text]O[Formula: see text], and it is the complex [Formula: see text] orbital occupied by the sixth electron at the high-spin Co[Formula: see text] ([Formula: see text]) sites that generates the Ising-like behavior. The ability to directly relate the orbital occupation with the local crystal structure is essential to model the magnetic properties of this system.
一维钴酸盐Ca[化学式：见原文]Co[化学式：见原文]O[化学式：见原文]是一种具有非常规磁结构的有趣材料，其磁化过程中表现出量子隧穿现象。使用新开发的实验方法，即[化学式：见原文]-芯能级非共振非弹性X射线散射（[化学式：见原文]-NIXS），我们能够对该系统中负责伊辛磁性的钴原子[化学式：见原文]轨道进行成像。我们可以直接观察到，在Ca[化学式：见原文]Co[化学式：见原文]O[化学式：见原文]中，对普遍接受的理想棱柱状三角晶场方案存在修正，并且正是高自旋Co[化学式：见原文]（[化学式：见原文]）位点上第六个电子所占据的复杂[化学式：见原文]轨道产生了类伊辛行为。将轨道占据与局部晶体结构直接关联的能力对于模拟该系统的磁性至关重要。
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