论文标题
抗铁磁相图的抗铁磁相图
Antiferromagnetic phase diagram of the cuprate superconductors
论文作者
论文摘要
以自旋屈服模型为描述库酸酯超导体的起点，我们获得了有效的非线性Sigma-Field Hamiltonian，它考虑了系统中掺杂的效果。我们获得了自旋波速度的表达，这是化学电位的函数。对于参数的适当值，我们确定YBA $ _2 $ _2 $ cu $ _3 $ o $ o $ _ {6+x} $化合物的抗磁磁相图作为掺杂剂浓度的函数，这与实验数据一致。此外，我们的方法为孔掺杂的相位图和电子掺杂化合物的相图提供了统一的描述，这与这些化合物的相图之间的显着相似性是一致的，因为我们已经获得了抑制抗铁磁相作为化学电位模量的抑制。然后，前面提到的结果是考虑到与在系统中添加孔有关的化学电位的正值，而负值对应于添加电子。
Taking the spin-fermion model as the starting point for describing the cuprate superconductors, we obtain an effective nonlinear sigma-field hamiltonian, which takes into account the effect of doping in the system. We obtain an expression for the spin-wave velocity as a function of the chemical potential. For appropriate values of the parameters we determine the antiferromagnetic phase diagram for the YBa$_2$Cu$_3$O$_{6+x}$ compound as a function of the dopant concentration in good agreement with the experimental data. Furthermore, our approach provides a unified description for the phase diagrams of the hole-doped and the electron doped compounds, which is consistent with the remarkable similarity between the phase diagrams of these compounds, since we have obtained the suppression of the antiferromagnetic phase as the modulus of the chemical potential increases. The aforementioned result then follows by considering positive values of the chemical potential related to the addition of holes to the system, while negative values correspond to the addition of electrons.
