Antiperovskite-type compounds with noncollinear spin arrangements have drawn great interest due to their rich strong-correlation properties associated with unique magnetic structures. Pressure is an effective way to tune the spin ordering and provoke novel phenomena by adjusting their complex exchange integrals. Here, we manipulate the unique magnetic structures in the frustrated antiperovskite $\mathrm{M}{\mathrm{n}}_3\mathrm{GaN}$ and try to clarify the evolution of strong-correlation physical properties under a high-pressure field up to 12 GPa. High-pressure induces the transition from the magnetic ground state with a typical 120 ° spin arrangement to a 90 ° spin configuration, and further to a ferromagnetic state. The observed anomalies in the electronic conduction and thermal expansion curves corresponding to the magnetic phase transitions are also gradually suppressed by pressure. Based on the high-pressure experiments, the T-P magnetic phase diagram is derived and the pressure-induced linear shift of the transition temperatures can be well observed. A spin model based on the classical Heisenberg theory was constructed to clarify the nature of the pressure effects, which is ascribed to the enhancement of the crystal field of N and the Mn-N-Mn superexchange contribution. Our results provide insight into the stabilization of noncollinear spin order.

中文翻译：

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受挫 Mn3GaN 反钙钛矿中磁性结构和压力诱导的强相关特性的操纵


具有非共线自旋排列的反钙钛矿型化合物由于其丰富的强相关特性与独特的磁性结构而引起了人们的极大兴趣。压力是调整自旋有序并通过调整其复杂交换积分来激发新现象的有效方法。在这里，我们操纵受挫反钙钛矿中独特的磁性结构 $\mathrm{M}{\mathrm{n}}_3\mathrm{GaN}$ 并试图阐明在高达12 GPa的高压场下强相关物理性质的演化。高压导致从典型的 120° 自旋排列的磁性基态转变为 90° 自旋结构，并进一步转变为铁磁态。与磁相变相对应的电子传导和热膨胀曲线中观察到的异常也逐渐被压力抑制。基于高压实验，推导了TP磁相图，可以很好地观察到压力引起的转变温度的线性变化。构建了基于经典海森堡理论的自旋模型，以阐明压力效应的本质，这归因于 N 晶体场的增强和 Mn-N-Mn 超交换的贡献。我们的结果提供了对非共线自旋顺序稳定性的深入了解。