论文标题
铁磁性绝缘体中补偿温度附近的核磁松弛时间
Nuclear Magnetic Relaxation Time near Compensation Temperature in Ferrimagnetic Insulator
论文作者
论文摘要
核磁性松弛时间$ T_1 $在铁磁绝缘子中是通过与偶然近似的超精细相互作用的拉曼相互作用计算得出的。发现一个站点上的1/$ T_1 $在补偿温度$ T_0 $附近迅速增加，而在另一个站点上并没有增加到Curie温度$ T_C $。这是由于软木棒的带宽与$ t_0 $相当。在另一种类型的Ferrimagnet中也发现了1/$ t_1 $以下1/$ T_1 $的行为，该行为在磁化强度的温度依赖性而不是补偿中显示出驼峰结构。同样在这种情况下，即使磁化不显示赔偿，我们也会发现1/$ T_1 $以下1/$ T_1 $的迅速增加。这种软镁的这种共存将导致Ferrimagnet的显着特性。
The nuclear magnetic relaxation time $T_1$ in ferrimagnetic insulators is calculated by a Raman process of hyperfine interaction with a meanfield approximation. It is found that the 1/$T_1$ on one site rapidly increases near the compensation temperature $T_0$, whereas that on another site does not increase up to Curie temperature $T_c$. This is due to that the band width of soft magnon becomes comparable to $T_0$. The increasing behavior of 1/$T_1$ below $T_c$ is found also in another type ferrimagnet, which shows hump structure in the temperature dependence of magnetization instead of compensation. Also in this case, we find the rapid increase of 1/$T_1$ below $T_c$, even though the magnetization does not show the compensation. Such a coexistence of soft and hard magnons will lead to remarkable properties of ferrimagnet.
