论文标题
模拟熵稳定氧化物中的自旋波
Simulating Spin Waves in Entropy Stabilized Oxides
论文作者
论文摘要
熵稳定的氧化物Mg $ _ {0.2} $ co $ _ {0.2} $ ni $ _ {0.2} $ cu $ _ {0.2} $ zn $ _ {0.2} $ _ {0.2} $展示了抗fiferromagnetic Order和磁性激励，如最近的中子中数散布散布的散布所揭示的那样。该观察结果提出了此类无序系统中自旋波激发性质的性质问题。在这里，我们从理论上研究了磁接地态和使用线性自旋理论与超级电池近似结合使用的自旋波激发，以考虑到该磁系统中的极端混乱。我们发现，实验观察到的抗铁磁结构可以通过菱形扭曲以及第二个最近的邻居相互作用来稳定。我们的计算表明，自旋波谱由一个定义明确的低能相干光谱组成，在不一致的连续体的背景下，该光谱延伸至较高的能量。
The entropy stabilized oxide Mg$_{0.2}$Co$_{0.2}$Ni$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$O exhibits antiferromagnetic order and magnetic excitations, as revealed by recent neutron scattering experiments. This observation raises the question of the nature of spin wave excitations in such disordered systems. Here, we investigate theoretically the magnetic ground state and the spin-wave excitations using linear spin-wave theory in combination with the supercell approximation to take into account the extreme disorder in this magnetic system. We find that the experimentally observed antiferromagnetic structure can be stabilized by a rhombohedral distortion together with large second nearest neighbor interactions. Our calculations show that the spin-wave spectrum consists of a well-defined low-energy coherent spectrum in the background of an incoherent continuum that extends to higher energies.
