Defect dependent multiple magnetization plateaus in frustrated spin-chain cobaltate

Defect dependent multiple magnetization plateaus in frustrated spin-chain cobaltate
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受挫自旋链钴酸盐中缺陷相关的多个磁化平台

DOI:
10.1016/j.jmmm.2013.02.037
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发表时间:
2013-07
影响因子:
2.7
通讯作者:
A. Du
A. Du
中科院分区:
材料科学3区
文献类型:
--
作者:
G. Wu;Y. Liu;X. Yang;A. Du

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采用基于Glauber算法和Metropolis算法的蒙特卡罗方法模拟了Ca3Co2O6中非磁性缺陷对低温磁化平台的影响。我们将微观自旋链的能量分布与常规模式相结合,明确地得到了磁化平台和微观自旋链组态之间的一一对应关系。数值结果表明,在能量竞争的基础上,在适当的浓度范围内,非磁性缺陷可以在微观尺度上激活新的各种不同的自旋链最近邻构型单元,导致更多不同高度的磁化平台。有趣的是,在相对较高的温度下仍然可以观察到这种现象,因为少量的稀释不仅可以大大提高基态的简并度,而且还可以防止形成相称的亚铁磁态。理论研究为控制这种平台行为提供了可能,这将为理解在几何受挫材料中观察到的多重磁化-平台现象提供更多的线索。
Monte Carlo techniques based on the Glauber and Metropolis algorithms are performed to simulate the influence of nonmagnetic defects on the low-temperature magnetization plateaus in Ca3Co2O6. We combine the microscopic spin-chain energy distributions with the conventional patterns and obtain unambiguously the one-to-one correspondence between magnetization plateaus and microscopic spin-chain configurations. Numerical results indicate that on the basis of the energy competition, nonmagnetic defects in a proper concentration range can activate the new diverse nearest-neighboring configurational cells of spin chains in a microscopic scale, inducing more magnetization plateaus with different heights. Interestingly, this phenomenon is still observed at a relatively high temperature because a little dilution can not only lift the degeneracy of ground state greatly but also prevent the form of commensurate ferrimagnetic state. Theoretical investigation provides a potential for governing such plateau behaviors and this will cast more light on the understanding of multiple magnetization-plateau phenomena observed in the materials with geometrical frustration.
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