We present a critical review of recent attempts to introduce a new quantum (‘Planckian’) limit for the temperature dependence of the inelastic scattering rate of electrons in metals. We briefly discuss the main experimental facts and some simple theoretical models explaining the linear-in-temperature growth of resistivity (starting from very low temperatures) in superconducting cuprates and some similar systems. There is no commonly accepted theoretical explanation for such behavior up to now. We also discuss the known quantum limits for electrical conductivity (resistance). It is shown that the universal Planckian limit for the inelastic relaxation rate proposed in some papers is a kind of delusion related to a certain procedure to represent the experimental data.

我们对最近为金属中电子的非弹性散射率的温度依赖性引入新的量子（“普朗克”）极限的尝试进行了批判性审查。我们简要讨论了主要的实验事实和一些简单的理论模型，这些模型解释了超导铜酸盐和一些类似系统中电阻率的线性温度增长（从非常低的温度开始）。到目前为止，对于这种行为还没有普遍接受的理论解释。我们还讨论了电导率（电阻）的已知量子极限。结果表明，一些论文提出的非弹性松弛率的普朗克极限是一种与一定程序相关的、代表实验数据的错觉。