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对BaCo(AsO) 受挫蜂窝晶格磁体中的磁有序和自旋动力学进行极化中子研究。

Polarized-neutron investigation of magnetic ordering and spin dynamics in BaCo(AsO) frustrated honeycomb-lattice magnet.

作者信息

Regnault L-P, Boullier C, Lorenzo J E

机构信息

Institut Laue Langevin, 71 avenue des Martyrs, 38042 Grenoble cedex 9, France.

BNP-Paribas, 20 boulevard des Italiens, 75009 Paris, France.

出版信息

Heliyon. 2018 Jan 12;4(1):e00507. doi: 10.1016/j.heliyon.2018.e00507. eCollection 2018 Jan.

DOI:10.1016/j.heliyon.2018.e00507
PMID:29560426
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5857630/
Abstract

The magnetic properties of the cobaltite BaCo(AsO), a good realization of the quasi two-dimensional frustrated honeycomb-lattice system with strong planar anisotropy, have been reinvestigated by means of spherical neutron polarimetry with CRYOPAD. From accurate measurements of polarization matrices both on elastic and inelastic contributions as a function of the scattering vector , we have been able to determine the low-temperature magnetic structure of BaCo(AsO) and reveal its puzzling in-plane spin dynamics. Surprisingly, the ground-state structure (described by an incommensurate propagation vector [Formula: see text], with [Formula: see text] and [Formula: see text]) appears to be a quasi-collinear structure, and not a simple helix, as previously determined. In addition, our results have revealed the existence of a non-negligible out-of-plane moment component [Formula: see text]/Co, representing about 10% of the in-plane component, as demonstrated by the presence of finite off-diagonal elements [Formula: see text] and [Formula: see text] of the polarization matrix, both on elastic and inelastic magnetic contributions. Despite a clear evidence of the existence of a slightly inelastic contribution of structural origin superimposed to the magnetic excitations at the scattering vectors [Formula: see text] and [Formula: see text] (energy transfer [Formula: see text] meV), no strong inelastic nuclear-magnetic interference terms could be detected so far, meaning that the nuclear and magnetic degrees of freedom have very weak cross-correlations. The strong inelastic [Formula: see text] and [Formula: see text] matrix elements can be understood by assuming that the magnetic excitations in BaCo(AsO) are spin waves associated with trivial anisotropic precessions of the magnetic moments involved in the canted incommensurate structure.

摘要

钴酸盐BaCo(AsO)是具有强平面各向异性的准二维受挫蜂窝晶格系统的一个很好实例，其磁性能已通过使用CRYOPAD的球形中子极化imetry重新进行了研究。通过对作为散射矢量函数的弹性和非弹性贡献的极化矩阵进行精确测量，我们得以确定BaCo(AsO)的低温磁结构，并揭示其令人费解的面内自旋动力学。令人惊讶的是，基态结构（由非公度传播矢量[公式：见正文]描述，其中[公式：见正文]和[公式：见正文]）似乎是一种准共线结构，而不是如先前确定的简单螺旋结构。此外，我们的结果揭示了存在不可忽略的面外磁矩分量[公式：见正文]/Co，占面内分量的约10%，这由极化矩阵的有限非对角元素[公式：见正文]和[公式：见正文]在弹性和非弹性磁贡献中的存在所证明。尽管有明确证据表明在散射矢量[公式：见正文]和[公式：见正文]处（能量转移[公式：见正文]毫电子伏特）存在叠加在磁激发上的结构起源的轻微非弹性贡献，但到目前为止尚未检测到强非弹性核磁干扰项，这意味着核自由度和磁自由度具有非常弱的交叉相关性。BaCo(AsO)中的磁激发是与倾斜非公度结构中涉及的磁矩的平凡各向异性进动相关的自旋波，据此可以理解强非弹性[公式：见正文]和[公式：见正文]矩阵元素。

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