过掺杂铜氧化物超导体的奇异金属相在低温下呈现电阻率随温度线性变化的特性，然而这一显著反常现象的起源仍未得到充分理解。本文研究了过掺杂铜氧化物超导体奇异金属相中电阻率的线性温度依赖关系。作者推导了由电子间通过交换自旋激发产生的倒逆散射所引起的输运散射率的动量依赖关系，并利用玻尔兹曼方程计算了电阻率。研究表明，电阻率主要由反节点和节点处的倒逆散射主导。特别地，存在一个极低的特征温度$T_{\ m scale}$，其与$Δ^{2}_{p}$成正比，其中$Δ_{p}$是反节点处的最小倒逆矢量。在高于$T_{\ m scale}$的低温区间，电阻率随温度线性变化，且温度线性系数随掺杂浓度的升高而减小；而在远低于$T_{\ m scale}$的温度区间，电阻率则随温度呈二次方变化。该理论还表明，同一种既作为玻色型胶黏剂将电子对结合在一起的自旋激发，也介导了奇异金属相中的电子散射，正是这一散射导致了低温下的电阻率线性温度依赖关系。
英文摘要：
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.
Low-temperature T$^{2}$ resistivity in the underdoped pseudogap phase versus T-linear resistivity in the overdoped strange-metal phase of cuprate superconductors
Impurity-Scattering Assisted Umklapp Scattering as the Origin of Low-Temperature Resistivity in the Normal-State of Cuprate Superconductors
Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；College of Physics, Chongqing University（重庆大学物理学院）；School of Physics, Beihang University（北京航空航天大学物理学院）；School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院）；Department of Physics, Beijing Normal University, Zhuhai（北京师范大学珠海校区物理系）
Correlation between the strength of low-temperature T-linear normal-state resistivity and $T_{\rm c}$ in overdoped electron-doped cuprate superconductors
本文在动能驱动超导框架内，揭示了过掺杂电子掺杂型铜氧化物超导体中由自旋激发同时介导的电子umklapp散射与电子配对，自然导致了低温T线性正常态电阻率强度与超导转变温度$T_{\ m c}$之间的内在关联。
Magnetothermopower and particle-hole symmetry in a cuprate strange metal
High Field Magnet Laboratory (HFML-FELIX), Radboud University（荷兰奈梅亨拉德堡德大学强磁场实验室）；Department of Physics and Department of Materials Science and Engineering, National Tsing Hua University（台湾新竹国立清华大学物理系与材料科学与工程学系）；Center for Quantum Science and Technology, National Tsing Hua University（台湾新竹国立清华大学量子科学技术中心）；Institut za fiziku, Bijenička 46, HR-10000, Zagreb, Croatia（克罗地亚萨格勒布物理研究所）；Institute for Molecules and Materials, Radboud University（荷兰奈梅亨拉德堡德大学分子与材料研究所）；Van der Waals-Zeeman Institute, University of Amsterdam（荷兰阿姆斯特丹大学范德瓦尔斯-泽曼研究所）；Wallenberg Initiative Materials Science for Sustainability, Uppsala University（瑞典乌普萨拉大学瓦伦堡可持续材料科学倡议）
Critical spin fluctuations across the superconducting dome in La$_{2-x}$Sr$_{x}$CuO$_4$
University of Bristol（布里斯托大学）；Tata Institute of Fundamental Research（塔塔基础研究所）；Flatiron Institute（平顿研究所）；Rutherford Appleton Laboratory（拉瑟福德·阿普尔顿实验室）；Harvard University（哈佛大学）
Singular spin fluctuations in the strange-metal phase of La2-xSrxCuO4
Univ. Grenoble Alpes, CNRS, Univ. Toulouse, INSA-T（格勒诺布尔阿尔卑斯大学，法国国家科学研究中心，图卢兹大学，国立应用科学学院）；LNCMI-EMFL, UPR3228（强磁场中心欧洲磁力实验室）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；Beijing National Laboratory for Condensed Matter Physics（北京凝聚态物理国家研究中心）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory（布鲁克海文国家实验室凝聚态物理与材料科学部）
The charge density fluctuations and the Shrinking Fermi Liquid scenario for strange metallicity in cuprates
CNR-INFM-SMC, and Dipartimento di Fisica, Sapienza Università di Roma（罗马大学物理系）；Institute for Theoretical Physics and Astrophysics, Computational Quantum Materials, Julius-Maximilians-Universität（维尔茨堡大学理论物理与天体物理研究所）；Institut für Physik, BTU Cottbus-Senftenberg（科特布斯-森夫滕贝格技术大学物理研究所）
