Study on 1/f fluctuations of electric resistance

1/f在热平衡中观察到的电阻波动归因于试样局部迁移率的波动。此外，由于电子声子散射引起的迁移率引起1/f波动，从这些观测结果可以看出，在热平衡中，线性响应系数一般以1/f波动。在此基础上，我们进行了介电常数和磁导率的观测实验。铁电材料硫酸甘油三酯和罗谢尔盐以及一种铁磁材料Gd作为试样。发现这些材料的介电常数和磁导率只有虚部的波动表现为1/f谱。我们已经得出结论，弛豫过程是波动的，或者热声子之间的弛豫具有1/f谱。为了直接观察热平衡中的声子波动，观察了这些材料的布里渊散射光强的强度波动。然而，我们还没有得到可靠的结果。

1/f fluctuations which are observed as fluctuations in electrical resistance in thermal equilibrium are attributed to fluctuations in local mobility of the specimen. Furthermore, the mobility due to electron phonon scattering causes 1/f fluctuations, From these observations it is quite probable that linear response coefficient in general fluctuates as 1/f in thermal equilibrium. Based on this idea we have performed experiments on obsevation of dielectric constant and permeablity.Ferroelectric materials, triglycine sulfate and Rochelle salt, and a ferromagnetic material, Gd, wew used as specimens. It is found that fluctuations of only the imaginary parts of the dielectric constant and the permeability of these materials show a 1/f spectrum. We have concluded that relaxation processes are fluctuating or relaxation amond thermal phonons have a 1/f spectrum.For a direct observation of phonon fluctuations in thermal equilibrium, intensity fluctuations of Brillouin scattering light intensity by these materials were observed. However, we have not obtained reliable result as yet.