arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1704.04514cond-mat.mtrl-sci
收藏

第一性原理计算对Co3Si结构、相变和磁性的研究

Structures, phase transitions, and magnetic properties of Co3Si from first-principles calculations

Xin Zhao, Shu Yu, Shunqing Wu, Manh Cuong Nguyen, Cai-Zhuang Wang, Kai-Ming Ho

摘要:

最近报道了Co3Si以纳米颗粒形式表现出显著的磁性[Appl.Phys.Lett. 108,152406(2016)],但要促进对该材料的更好理解。本文采用自适应遗传算法对Co3Si的晶体结构进行了研究,并从第一性原理计算出发讨论了Co3Si的电磁性质。从我们的计算中发现了Co3Si的几个竞争相。结果表明,实验中报道的六方Co_3Si结构在零温下的非磁性态比铁磁性态具有更低的能量。铁磁态的六方结构是动态不稳定的虚声子模式,并转变为一个新的正交结构,这是证实了我们的结构搜索具有最低的能量为Co3Si和Co3Ge。详细研究了实验六方结构和结构搜索得到的最低能量结构的磁性。

英文摘要:

Co3Si was recently reported to exhibit remarkable magnetic properties in the nanoparticle form [Appl. Phys. Lett. 108, 152406 (2016)], yet better understanding of this material is to be promoted. Here we report a study on the crystal structures of Co3Si using adaptive genetic algorithm, and discuss its electronic and magnetic properties from first-principles calculations. Several competing phases of Co3Si have been revealed from our calculations. We show that the hexagonal Co3Si structure reported in experiments has lower energy in non-magnetic state than ferromagnetic state at zero temperature. The ferromagnetic state of the hexagonal structure is dynamically unstable with imaginary phonon modes and transforms to a new orthorhombic structure, which is confirmed by our structure searches to have the lowest energy for both Co3Si and Co3Ge. Magnetic properties of the experimental hexagonal structure and the lowest-energy structures obtained from our structure searches are investigated in detail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑