论文标题
通过控制B-抗铁矿疾病的磁性调制磁性la2mncoo6膜
Modulation of magnetic property of double-perovskite La2MnCoO6 films by controlling B-antisite disorder
论文作者
论文摘要
双钙钛矿的预测物理特性通常因其固有的B-抗铁矿（AS）疾病效应而受到损害，但是对于LA2MNCOO6（LMCO）系统而言，它们之间的关系仍不清楚。这项研究的重点是控制AS障碍，并定量揭示了与（111）SRTIO3底物生长的外延LMCO膜中的磁和电子状态的相关性。通过调整饱和磁化和X射线反射曲线评估的生长条件来精确控制AS分数。在5 K处的饱和磁化从每个公式单位的6 UB线性降低50％，因为AS的分数从0（完美排序）增加到0.5（完全无序）。 X射线吸收光谱表明，MN和CO的价态分别为4+（3d^3）和2+（3D^7），而不论分数如何。提出了一个局部自旋命中模型来解释有和没有疾病和MN/CO价状态的净磁化，这表明只有在反坐石处的CO的局部自旋力矩重新排列在调节该LMCO系统中的磁性方面起着关键作用。
The predicted physical properties of double perovskites have usually been compromised by their intrinsic B-antisite (AS) disorder effect, but the relationship between them is still unclear for the La2MnCoO6 (LMCO) system. This study focuses on controlling the AS disorder and quantitatively reveals correlations with magnetic and electronic states in epitaxial LMCO films grown on (111) SrTiO3 substrates. The AS fraction was precisely controlled by tuning the growth conditions as evaluated from saturation magnetization and x-ray reflection profiles. The saturation magnetization at 5 K decreased linearly from 6 uB per formula unit by 50% as the AS fraction increased from 0 (perfectly ordered) to 0.5 (fully disordered). The x-ray absorption spectroscopy revealed that valence states of Mn and Co were 4+ (3d^3) and 2+ (3d^7), respectively, regardless of AS fraction. A local-spin-moment model is proposed to explain the net magnetizations with and without AS disorder and Mn/Co valence states, suggesting that only the rearrangement of local spin moment of Co at the antisite plays a key role in tuning the magnetism in this LMCO system.
