Magnetic Properties of Spin-Ladder Compound Sr14 （Cu1-yFey）24O41

Magnetic properties of spin-ladder compounds Sr14（Cu1-yFey）24O41 （0 ≤ y ≤ 0.05） are investigated in the temperature range from 10 to 300 K. The result reveals that all the samples exhibit magnetic crossover behavior in the paramagnetic range, and Fe^3＋ doping can efficiently increase the susceptibility due to the large moment of Fe^3＋. Both the observations are consistent with our previous investigation on transport behaviors, indicating the strong correlation between the magnetism and transport behaviors. The spin gap is evidenced in all the samples, and strengthens as Fe^3＋ doping level increases, which can be associated with the antiferromagnetic interaction between Fe^3＋ and Cu cations.     

半导体激光器大气传输激光通信研究

描述一种激光大气传输通信系统。采用光作为载体,将声音和数据信息发送给接收器。与该系统相连的计算机能够通过一此接口与其它计算机连接。这种激光大气传输系统有体积小、重量轻、适应性强、便利、安全和抗干扰的特点。