arXiv 2001.109232020-01-29cond-mat.str-elcond-mat.mtrl-sci

Mott绝缘CoO中的磁涨落和自旋轨道相互作用

Magnetic Fluctuations and the Spin-Orbit Interaction in Mott Insulating CoO

P. M. Sarte, S. D. Wilson, J. P. Attfield, C. Stock

备注：: (34 pages, 8 figures, 3 tables, submitted as part of a special issue of JPCM on X-ray and Neutron Scattering and dedicated to the memory of Prof. R. A. Cowley)
发表信息：: J. Phys. Condens. Matter 32, 374011 (2020)
DOI：: 10.1088/1361-648X/ab8498

摘要：

受到CoO中存在未淬灭轨道角动量的激励，Chalk River的一个团队，包括最近聘请的研究人员Roger Cowley，在经典的莫特绝缘体上进行了第一次非弹性中子散射实验[Sakurai $\textit{et al.}$ 1968 Phys. Rev. $\mathbf{167}$ 510]。尽管在区域边界识别了磁振子模式，但该团队无法使用传统的伪玻色子方法来参数化$T\rm{_{N}}$以下的低能磁激发光谱。再过40年，罗杰，现在在牛津大学，受到高$T_{c}$铜酸盐超导体的发现的激励[Bednorz & Muller 1986 Z.物理B $\mathbf{64}$ 189]，将作出另一次尝试，在参数化的磁激发光谱，以前提到他。当他回到首席运营官，罗杰发现一个系统卷入了争议，其一些最基本的参数仍然没有确定。面对如此艰巨的任务，罗杰在2010年初对CoO和磁稀释结构类似物MgO进行了一系列非弹性中子散射实验。这些实验将证明有助于测定CoO的单离子[Cowley $\textit{et al.}$ 2013 Phys. Rev. B $\mathbf{88}$ 205117]和协同磁性参数[Sarte $\textit{et al.}$ 2018 Phys. Rev. B $\mathbf{98}$ 024415]。这两组参数最终将用于自旋轨道激子模型[Sarte $\textit{et al.}$ 2019 Phys. Rev. B $\mathbf{100}$ 075143]，由他的老朋友和合作者Bill Buyers开发，成功地参数化了近50年前在Chalk River测量的复杂光谱。首席运营官的故事是一个完整的循环，一个充满了壮观的失败和间歇性的，但深刻的，小胜利。

英文摘要：

Motivated by the presence of an unquenched orbital angular momentum in CoO, a team at Chalk River, including a recently hired research officer Roger Cowley, performed the first inelastic neutron scattering experiments on the classic Mott insulator [Sakurai $\textit{et al.}$ 1968 Phys. Rev. $\mathbf{167}$ 510]. Despite identifying magnon modes at the zone boundary, the team was unable to parameterise the low energy magnetic excitation spectrum below $T\rm{_{N}}$ using conventional pseudo-bosonic approaches. It would not be for another 40 years that Roger, now at Oxford and motivated by the discovery of the high-$T_{c}$ cuprate superconductors [Bednorz & Muller 1986 Z. Phys. B $\mathbf{64}$ 189], would make another attempt at the parameterisation of the magnetic excitation spectrum that had previously alluded him. Upon his return to CoO, Roger found a system embroiled in controversy, with some of its most fundamental parameters still remaining undetermined. Faced with such a formidable task, Roger performed a series of inelastic neutron scattering experiments in the early 2010's on both CoO and a magnetically dilute structural analogue MgO. These experiments would prove instrumental in the determination of both single-ion [Cowley $\textit{et al.}$ 2013 Phys. Rev. B $\mathbf{88}$ 205117] and cooperative magnetic parameters [Sarte $\textit{et al.}$ 2018 Phys. Rev. B $\mathbf{98}$ 024415] for CoO. Both these sets of parameters would eventually be used in a spin-orbit exciton model [Sarte $\textit{et al.}$ 2019 Phys. Rev. B $\mathbf{100}$ 075143], developed by his longtime friend and collaborator Bill Buyers, to successfully parameterise the complex spectrum that both measured at Chalk River almost 50 years prior. The story of CoO is of one that has come full circle, one filled with both spectacular failures and intermittent, yet profound, little victories.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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