Competing magnetostructural phases in a semiclassical system
Competing magnetostructural phases in a semiclassical system
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DOI：
10.1038/s41535-017-0065-0
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发表时间：
2017-11
影响因子：
5.7
通讯作者：
K. O’Neal;Jun Hee Lee;Maengsuk Kim;J. Manson;Zhenxian Liu;R. Fishman;J. Musfeldt
中科院分区：
文献类型：
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作者：
K. O’Neal;Jun Hee Lee;Maengsuk Kim;J. Manson;Zhenxian Liu;R. Fishman;J. Musfeldt
电荷、结构和磁性之间的相互作用在复杂材料中产生了丰富的相图，当相竞争时，会出现奇异的特性。基于分子的材料由于其低能量尺度、柔性晶格和化学可调谐性而在这方面特别有利。在这里，我们汇集了高压拉曼散射，建模和第一性原理计算，以揭示Mn[N（CN）2]2的压力-温度-磁场相图。我们揭示了如何隐藏的软模式涉及八面体旋转驱动两个压力引起的转变触发低→高磁各向异性交叉和交换平面的独特重定向。这些磁结构转变及其机制突出了自旋-晶格相互作用在含Mn（II）系统中建立具有新磁性能的相的重要性。
The interplay between charge, structure, and magnetism gives rise to rich phase diagrams in complex materials with exotic properties emerging when phases compete. Molecule-based materials are particularly advantageous in this regard due to their low energy scales, flexible lattices, and chemical tunability. Here, we bring together high pressure Raman scattering, modeling, and first principles calculations to reveal the pressure–temperature–magnetic field phase diagram of Mn[N(CN)2]2. We uncover how hidden soft modes involving octahedral rotations drive two pressure-induced transitions triggering the low → high magnetic anisotropy crossover and a unique reorientation of exchange planes. These magnetostructural transitions and their mechanisms highlight the importance of spin–lattice interactions in establishing phases with novel magnetic properties in Mn(II)-containing systems.