Температурно-барические особенности магнитных характеристик в системах со структурными переходами типа смещения

Физика твердого тела Pub Date : 2023-01-01 DOI:10.21883/ftt.2023.02.54303.523

В.Я. Вальков, А.В. Головчан, И.Ф. Грибанов, Б.М. Тодрис, Е.П. Андрейченко, В. И. Митюк, А. В. Маширов

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Abstract

Using pnictides MnAs and germaindes Mn0.89Cr0.11NiGe as an example, the transformation of thermobaric features of their magnetic characteristics at high pressures is considered. A unified approach is used to describe paramagnetic (PM) structural transitions of the displacement type with a change in the symmetry PM(P63/mmc)-PM(Pnma) from hexagonal to orthorhombic. It is shown that the competition between the parameters of the structural and magnetic orders in both systems manifests itself differently in the stabilization and alternation of the so-called high-spin and low-spin magnetically ordered states initiated by pressure. As a consequence, the structural contribution in these systems weakens (MnAs) or enhances (Mn0.89Cr0.11NiGe ) the giant magnetocaloric effect in the temperature-baric region of the first-order magnetostructural phase transitions.

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偏移型结构转移系统中磁性温度特征

以pnictides MnAs和germanmaindes mn0.89 cr0.11 nge为例，研究了它们的磁性在高压下的温压特征转变。用一种统一的方法描述了顺磁(PM)位移型的结构转变，即对称的PM(P63/mmc)-PM(Pnma)从六边形到正交态的变化。结果表明，两种系统的结构有序和磁有序参数之间的竞争在压力引发的高自旋和低自旋磁有序态的稳定和交替中表现得不同。因此，这些体系中的结构贡献减弱了(MnAs)或增强了(Mn0.89Cr0.11NiGe)一阶磁结构相变温度-气压区的巨磁热效应。

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Физика твердого тела

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