Chemical Disorder-Driven Cluster Spin Glass in Pseudobinary Co2Zn10.2Mn0.8: An Experimental and Theoretical Study

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Inorganic Chemistry Pub Date : 2025-03-22 DOI:10.1021/acs.inorgchem.4c05506

Amit Mondal, Shubham Patel, Rahul Pan, Sandip Kumar Kuila, Riju Dey, Lars Schumacher, Anup Kumar Bera, Rainer Pöttgen, Partha Pratim Jana

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Abstract

The investigation focuses on Mn substitution in Co₂Zn₁₁, prepared by pursuing a solid-state sealed tube method under high vacuum. We report the crystal structure and magnetic properties of Co₂Zn_10.2Mn_0.8 in detail. Co₂Zn_10.2Mn_0.8 adopts the noncentrosymmetric space group I4̅3m (No. 217), and the distribution of Co, Mn, and Zn atoms is confirmed using X-ray and neutron powder diffraction (NPD) techniques. The magnetic studies reveal cluster glass (CG) formation below the spin-freezing temperature of 23.1 K in Co₂Zn_10.2Mn_0.8, also indicated by the large value of the characteristic relaxation time (τ₀) of ∼10^–8 s. This large value of τ₀ supports the formation of magnetic clusters. The magnetic moment primarily originates due to the spins of Mn atoms, which is realized from significant differences between majority- and minority-spin channels of Mn 3d states in the projected density of states curves.

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伪二元 Co2Zn10.2Mn0.8 中化学紊乱驱动的簇状自旋玻璃：实验与理论研究

这项研究的重点是 Co2Zn11 中的锰置换，其制备方法是在高真空条件下采用固态密封管法。我们详细报告了 Co2Zn10.2Mn0.8 的晶体结构和磁性能。Co2Zn10.2Mn0.8 采用非五次对称空间群 I4̅3m（No.217），并利用 X 射线和中子粉末衍射（NPD）技术确认了 Co、Mn 和 Zn 原子的分布。磁性研究显示，Co2Zn10.2Mn0.8 在自旋凝固温度 23.1 K 以下形成了玻璃簇（CG），特征弛豫时间（τ0）的大值 ∼10-8 s 也表明了这一点。磁矩主要来源于锰原子的自旋，这一点可以从锰 3d 态的多数自旋和少数自旋通道在投影态密度曲线上的显著差异中看出来。

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.