论文部分内容阅读
本文首先仔细地介绍了浮区法生长Y掺杂的(Tb1-xYx)2Ti2O7单晶(x=0,0.1,0.5)的条件,并基于高品质的单晶样品,详细地研究了其磁性质、比热及热输运行为.(Tb1-xYx)2Ti2O7单晶在～80K时开始出现短程磁关联相互作用,非磁性离子Y3+的掺杂稀释了Tb3+的浓度,削弱了体系中的磁关联相互作用并引起了局部晶格的畸变,导致晶体场能级劈裂的加剧,而磁场则会增强体系中的关联相互作用,同时塞曼效应加剧了双重态能级的劈裂.热导率测量中发现Tb3+间的磁关联相互作用引起的自旋涨落抑制了声子的导热,而Y的掺杂并没有根本性地破坏这种关联相互作用.
In this paper, the conditions for the growth of Y-doped (Tb1-xYx) 2Ti2O7 single crystal (x = 0,0.1,0.5) by floating zone method are carefully introduced. Based on the high quality single crystal samples, the magnetic properties (Tb1-xYx) 2Ti2O7 single crystal at ~ 80K began to appear short-range magnetic association interaction, the non-magnetic ion Y3 + doping diluted Tb3 concentration, weakening the magnetic correlation in the system Which leads to the local lattice distortion, leading to the exacerbation of the crystal field level splitting, while the magnetic field will enhance the system interaction, and the Zeeman effect aggravates the splitting of the double state energy level. It was found that the spin-on induced by the magnetic interaction between Tb3 + suppressed the thermal conduction of phonons, whereas the doping of Y did not fundamentally undermine this related interaction.