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arXiv 1902.09655cond-mat.mtrl-scicond-mat.str-el
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混合反铁磁系统Mn $_{1-x}$ Fe $_{x}$ PSe $_3$的强各向异性

Strong anisotropy in the mixed antiferromagnetic system Mn$_{1-x}$Fe$_{x}$PSe$_3$

Ankita Bhutani, Julia L. Zuo, Rebecca D. McAuliffe, Clarina R. dela Cruz, Daniel P. Shoemaker

摘要:

本文报道了Mn $_{1-x}$ Fe $_{x}$ PSe $_3$的磁相图,它代表了两个反铁磁系统的无规磁体系统,在它们各自的反铁磁结构中具有混合自旋、混合自旋各向异性、混合最近邻磁相互作用和混合周期性。制备了Mn $_{1-x}$ Fe $_{x}$ PSe $_3$块体样品,并用粉末X射线衍射、中子衍射和X射线荧光光谱表征了样品的相纯性。利用粉末中子衍射、直流磁化率和热容,确定了磁有序态的性质和程度。在$x = 0.0$和0.25(MnPSe $_3$型)之间以及在$x = 0.875$和$1$(FePSe $_3$型)之间存在长程磁有序。在$x = 0.25$和$0.875$之间建立了MnPSe $_3$ -和FePSe $_3$ -型纳米团簇存在的短程磁序。在直流磁化测量的不可逆性,也具有等温和thermorecomposition磁化测量表明相似的磁性纳米粒子,其中未补偿的表面自旋导致在非零TRM和磁响应,进一步加强存在的磁性纳米簇或域。在类似的Mn $_{1-x}$ Fe $_x$ PS $_3$中观察到的自旋玻璃态已被排除,并且表现出两种有序类型的纳米簇的形成是由异常高的各向异性值引起的。配体贡献的自旋-轨道相互作用的效果已被建议作为一个可能的解释高$D$值在这些化合物。

英文摘要:

We report the magnetic phase diagram of Mn$_{1-x}$Fe$_{x}$PSe$_3$ which represents a random magnet system of two antiferromagnetic systems with mixed spin, mixed spin anisotropies, mixed nearest neighbor magnetic interactions and mixed periodicities in their respective antiferromagnetic structure. Bulk samples of Mn$_{1-x}$Fe$_{x}$PSe$_3$ have been prepared and characterized phase pure by powder X-ray and neutron diffraction and X-ray fluorescence. Nature and extent of magnetically ordered state has been established using powder neutron diffraction, dc magnetic susceptibility and heat capacity. Long-range magnetic ordering exists between $x = 0.0$ and 0.25 (MnPSe$_3$-type) and between $x = 0.875$ and $1$ (FePSe$_3$-type). A short-range magnetic order with existence of both MnPSe$_3$- and FePSe$_3$-type nano-clusters has been established between $x = 0.25$ and $0.875$. Irreversibility in dc magnetization measurements, also characterized by isothermal and thermoremanent magnetization measurements suggest similarities to magnetic nanoparticles where uncompensated surface spins result in a non-zero TRM and IRM response, further reinforcing existence of magnetic nano-clusters or domains. A spin glass state, observed in analogous Mn$_{1-x}$Fe$_x$PS$_3$, has been ruled out and formation of nano-clusters exhibiting both ordering types results from unusually high anisotropy values. The effect of ligand contributions to the spin-orbit interactions has been suggested as a possible explanation for high $D$ values in these compounds.

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