Comment on ‘Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2’

Comment on ‘Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2’
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对“Li2CuO2 共边 CuO2 链中氧空位引起的磁矩”的评论

DOI:
10.1088/1367-2630/aac159
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发表时间:
2018
影响因子:
3.3
通讯作者:
T. Ito
T. Ito
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
R. O. Kuzian;R. Klingeler;W. E. A. Lorenz;N. Wizent;S. Nishimoto;U. Nitzsche;H. Rosner;D. Milosavljevic;L. Hozoi;R. Yadav;J. Richter;A. Hauser;J. Geck;R. Hayn;V. Yushankhai;L. Siurakshina;C. Monney;T. Schmitt;J. Thar;G. Roth;T. Ito

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在最近一项专门研究 Li 2 CuO 2 磁性的工作中,Shu 等人 (2017 New J. Phys. 19, 023026) 提出了一种“简化的”非受挫微观模型,该模型与数十年来改进的模型有很大不同。我们表明,所提出的模型与已知的实验数据不一致,包括报道的高达 550 K 的磁化率 χ (T) 数据。使用 χ (T) 的 8 阶高温展开,我们表明 Li 2 CuO 2 的实验数据与非弹性中子散射研究得出的先前模型一致。我们还建立了真实受挫磁系统的居里-韦斯定律的 T 范围。我们认为,T< T N 的长程有序磁结构和受限 T 范围内的 χ (T) 的知识不足以提供足够的信息来提取受挫磁体中的所有相关耦合;饱和场和 INS 数据还必须用于确定几个交换耦合,包括微弱但决定性的令人沮丧的反铁磁链间耦合。
In a recent work devoted to the magnetism of Li 2 CuO 2, Shu et al (2017 New J. Phys. 19, 023026) have proposed a'simplified'unfrustrated microscopic model that differs considerably from the models refined through decades of prior work. We show that the proposed model is at odds with known experimental data, including the reported magnetic susceptibility χ (T) data up to 550 K. Using an 8th order high-temperature expansion for χ (T), we show that the experimental data for Li 2 CuO 2 are consistent with the prior model derived from inelastic neutron scattering studies. We also establish the T-range of validity for a Curie–Weiss law for the real frustrated magnetic system. We argue that the knowledge of the long-range ordered magnetic structure for T< T N and of χ (T) in a restricted T-range provides insufficient information to extract all of the relevant couplings in frustrated magnets; the saturation field and INS data must also be used to determine several exchange couplings, including the weak but decisive frustrating antiferromagnetic interchain couplings.
含一维 CuO2 带状链的 Li2CuO2 中不存在螺旋磁序
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