论文标题
温度与掺杂相位图
Temperature vs. doping phase diagram of cuprate superconductors
论文作者
论文摘要
从Cuprate超导体的自旋特性模型开始，我们通过整合自旋自由度来获得电荷载体的有效相互作用。我们的模型预测了超导相互作用耦合的量子临界点，这为系统中超导性发作设定了阈值。我们表明，这种耦合的物理值低于此阈值，从而解释了为什么未掺杂系统没有超导阶段。然后，通过包括掺杂，我们发现临界温度的圆顶形依赖性是将电荷载体添加到系统中的圆顶依赖性，这与实验相图一致。在最佳掺杂$ t_c \ sim $ 45 K时，计算超导临界温度，而无需调整任何自由参数和产量，这与实验数据相当。
Starting from a spin-fermion model for the cuprate superconductors, we obtain an effective interaction for the charge carriers by integrating out the spin degrees of freedom. Our model predicts a quantum critical point for the superconducting interaction coupling, which sets up a threshold for the onset of superconductivity in the system. We show that the physical value of this coupling is below this threshold, thus explaining why there is no superconducting phase for the undoped system. Then, by including doping, we find a dome-shaped dependence of the critical temperature as charge carriers are added to the system, in agreement with the experimental phase diagram. The superconducting critical temperature is calculated without adjusting any free parameter and yields, at optimal doping $ T_c \sim $ 45 K, which is comparable to the experimental data.
