论文标题
由于旋转激发的umklapp散射，在奇怪的铜层超导体中奇怪的金属阶段中的低温T线性电阻率
Low-temperature T-linear resistivity in the strange metal phase of overdoped cuprate superconductors due to umklapp scattering from a spin excitation
论文作者
论文摘要
过量的铜酸盐超导体的奇怪金属相在低温下表现出温度电阻率的线性，但是，这种非凡的异常的起源仍未得到充分了解。在这里，研究了电阻率在过量的库酸酯超导体的奇怪金属相中的线性温度依赖性。通过使用Boltzmann方程来得出并使用了通过旋转激发的交换来计算电阻率，从而通过旋转激发的交换而产生的传输散射速率的动量依赖性。结果表明，电阻率主要由抗衰变和节点umklapp散射支配。特别是，使用$δ^{2} _ {p} $的非常低的温度$ t _ {\ rm scale} $比例，其中$δ_{p} $是antinode处的最小umklapp向量。在高于$ t _ {\ rm刻度} $的低温下，电阻率在温度下是线性的，温度线性系数随着掺杂的增加而降低，但是，在较低的温度以下$ t _ {\ rm scale} $以下，相反，电阻率在温度下是Quadratic的。该理论还表明，相同的旋转激发像骨胶一样，将电子对保持在一起，还介导了奇怪的 - 金属相中的电子散射，负责低温下温度电阻率的线性。
The strange-metal phase of overdoped cuprate superconductors exhibits a linear in temperature resistivity in the low temperature, however, the origin of this remarkable anomaly is still not well understood. Here the linear temperature dependence of the resistivity in the strange-metal phase of overdoped cuprate superconductors is investigated. The momentum dependence of the transport scattering rate arising from the umklapp scattering between electrons by the exchange of the spin excitations is derived and employed to calculate the resistivity by making use of the Boltzmann equation. It is shown that the resistivity is mainly dominated by the antinodal and nodal umklapp scattering. In particular, a very low temperature $T_{\rm scale}$ scales with $Δ^{2}_{p}$, where $Δ_{p}$ is the minimum umklapp vector at the antinode. In the low temperature above $T_{\rm scale}$, the resistivity is linear in temperature with the temperature linear coefficient that decreases with the increase of doping, however, in the far lower temperature below $T_{\rm scale}$, the resistivity is instead quadratic in temperature. The theory also shows that the same spin excitation that acts like a bosonic glue to hold the electron pairs together also mediates scattering of electrons in the strange-metal phase responsible for the linear in temperature resistivity in the low temperature.
