Abstract

Influence of the chemical pressure (x) in single crystals of Fe_xMn_1 – xS (0.12 ≤ x ≤ 0.29) on the spin state of iron ions was studied by Mössbauer spectroscopy in the temperature range from 4.2 to 300 K. Peculiarities of formation of the paramagnetic and antiferromagnetic phases of solid solutions were found. Substitution of Fe²⁺ cations in the high-spin state for Mn²⁺ was found to occur in Fe_xMn_1 – xS as x changes. A decrease in the distance between the ions in Fe_xMn_1 – xS induces changes in the state of the Fe²⁺ ions in the samples with x = 0.25 and 0.29. The asymmetry parameter of the electric field gradient (EFG) tensor and the angle between the directions of the magnetic moment and the principal axis of the electric field gradient were found to change in the magnetically ordered phase at 4.2 K; the angle between the magnetic moment and the electric field gradient axis changes from 21° in the sample with x = 0.12 to 33° when x = 0.29.

中文翻译：

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化学压力在Fe x Mn 1 – x S中引起Fe 2+离子的磁性态

摘要

化学压力（影响X中的Fe的单晶）_X的Mn _{1 -  X} S（0.12≤ X ≤0.29）上的铁离子的自旋状态，研究了穆斯堡尔谱在温度范围从4.2至300个K.特殊性发现固溶体的顺磁性和反铁磁性相的形成。发现在Fe _x Mn _{1 – x} S中，随着x的变化，高自旋态的Fe ²⁺阳离子取代了Mn ²⁺。Fe _x Mn _{1- x} S中离子之间距离的减小会引起Fe状态的变化  样品中的²⁺离子，x = 0.25和0.29。发现电场梯度（EFG）张量的不对称参数以及磁矩方向与电场梯度主轴之间的夹角在4.2 K时在磁有序相中发生了变化。磁矩和电场梯度轴之间的角度从x = 0.12的样品中的21°变为x = 0.29时的33° 。