论文标题
铁空位对旋转梯子Bafe $ _ {2-δ} $ s $ _ {1.5} $ SE $ _ {1.5} $的磁性顺序和旋转动力学的影响
Effect of iron vacancies on the magnetic order and spin dynamics of the spin ladder BaFe$_{2-δ}$S$_{1.5}$Se$_{1.5}$
论文作者
论文摘要
准二维铁硫代基的具有各种磁状态，具体取决于晶格失真，电子相关性和缺陷的存在。我们在旋转梯子化合物BAFE $ _ {2-δ} $ s $ _ {1.5} $ se $ _ {1.5} $的带有$ \ sim $ 6％的铁空位上的旋转梯子化合物$ _ {2-δ} $ s $ _ {1.5} $ _ {1.5} $ _ {1.5} $ _ {1.5} $ _ {1.5} $ _ {1.5} $ _ {2-δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ {2-Δ} $ _ $ 6％的铁空位。数据表明，不存在远程磁性，而观察到与条纹和块类抗磁磁相关的特征磁激发。第一原理计算支持实验样品中条带和块类抗铁磁短距离的存在。远程磁性阶的消失可能是由于这两个磁序之间的竞争，这对于一定浓度的铁空位而言大大提高，我们计算为约6％，与测得的铁空位浓度一致。我们的结果强调了铁基旋转梯子系统中的铁空位如何强烈影响磁接地状态。
Quasi-one-dimensional iron chalcogenides possess various magnetic states depending on the lattice distortion, electronic correlations, and presence of defects. We present neutron diffraction and inelastic neutron scattering experiments on the spin ladder compound BaFe$_{2-δ}$S$_{1.5}$Se$_{1.5}$ with $\sim$6% iron vacancies. The data reveal that long-range magnetic order is absent, while the characteristic magnetic excitations that correspond to both the stripe- and block-type antiferromagnetic correlations are observed. First-principles calculations support the existence of both stripe and block-type antiferromagnetic short-range order in the experimental sample. The disappearance of long-range magnetic order may be due to the competition between these two magnetic orders, which is greatly enhanced for a certain concentration of iron vacancies, which we calculate to be about 6%, consistent with the measured iron vacancy concentration. Our results highlight how iron vacancies in the iron-based spin ladder system strongly influence the magnetic ground state.
