本文综述了基于铁基超导体系掺杂调控的新型稀磁半导体研究进展。首先从阐述稀磁半导体和铁基超导体的研究现状入手,指出研究基于铁基超导体系掺杂调控的新型稀磁半导体的优势,然后对于“111”、“1111”、“122”相,分别简述了其制备方法和晶体结构、物性测量手段和方法、理论分析和模拟计算等。特别地,对新型稀磁半导体研究中报道的最新样品合成思路和最新测量手段作了分析和说明。最后,对探索铁磁居里转变温度更高、性能更好的新型稀磁半导体作了总结和展望。 The research progress of new diluted magnetic semiconductors which are based on the types of iron-based superconductor systems was reviewed. From the viewpoint of the three types of new diluted magnetic semiconductors, the synthesis methods and crystal structure, the property measurements and calculation methods were introduced, respectively. In particular, the new idea of synthesis and new measurement technologies were analyzed. Finally, some suggestions were presented for exploring higher ferromagnetic Curie temperatures and better characters of diluted magnetic semiconductors.
稀磁半导体,电荷,自旋,双位掺杂,铁基超导体, Diluted Magnetic Semiconductors Charge Spin Double-Site Doping Iron-Based Superconductor新型稀磁半导体研究的最新进展
F. Sun, N. N. Li等人 [48] 第一次将XMCD用于新型稀磁半导体(Ba1 −xKx)(Zn1 −yMny)2As2的研究,As自旋磁矩与Mn平行,轨道磁矩与Mn相反,每个As离子的轨道磁矩与Tc成线性关联(如图6),载流子偏振化与铁磁序密切相关;(Ba0.75K0.25)(Zn0.95Mn0.05)2As2的AsK-边XMCD信号随加压增加而减小,加压下 AsXMCD强度的减少显示Mn离子间铁磁交换作用的减小,说明加压是调控磁性的有效途径(如图7);
此物理图像虽然来源于Ba1 −xKx(Zn1 −yMny)2As2,但可以推广到其他稀磁半导体:传统的密度泛函理论可精准描述新型稀磁半导体。磁相互作用来源于As空穴载流子为中介的短程超交换作用与长程自旋相互作用的竞争,后者可看作用有效p-d耦合 J H en 替代Hund’s耦合JH时对传统双交换作用的修正。
张莉,陈浩泽,李林先,冯山,王少雷. 新型稀磁半导体研究的最新进展 The Research Progress of New Diluted Magnetic Semiconductors[J]. 凝聚态物理学进展, 2018, 07(01): 27-42. http://dx.doi.org/10.12677/CMP.2018.71005
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