We consider the implications of a phenomenological model self-energy for the charge transport properties of the metallic phase of the overdoped cuprate superconductors. The self-energy is the sum of two terms with characteristic dependencies on temperature, frequency, location on the Fermi surface, and doping. The first term is isotropic over the Fermi surface, independent of doping, and has the frequency and temperature dependence characteristic of a Fermi liquid. The second term is anisotropic over the Fermi surface (vanishing at the same points as the superconducting energy gap), strongly varies with doping (scaling roughly with $T_c$, the superconducting transition temperature), and has the frequency and temperature dependence characteristic of a marginal Fermi liquid. Previously it has been shown this self-energy can describe a range of experimental data including angle-dependent magnetoresistance (ADMR) and quasi-particle renormalisations determined from specific heat, quantum oscillations, and angle-resolved photo-emission spectroscopy (ARPES). Without introducing new parameters and neglecting vertex corrections we show that this model self-energy can give a quantitative description of the temperature and doping dependence of a range of reported transport properties of Tl2201 samples. These include the intra-layer resistivity, the frequency dependent optical conductivity, the intra-layer magnetoresistance, and the Hall coefficient. The temperature dependence of the latter two are particularly sensitive to the anisotropy of the scattering rate and to the shape of the Fermi surface. In contrast, the temperature dependence of the Hall angle is dominated by the Fermi liquid contribution to the self-energy that determines the scattering rate in the nodal regions of the Fermi surface.
Magnetic Breakdown in the electron-doped cuprate superconductor Nd$_{2-x}$Ce$_x$CuO$_4$: the reconstructed Fermi surface survives in the strongly overdoped regime
本文报道了电子过掺杂铜氧化物超导体Nd $_{2-x}$ Ce $_x$ CuO $_4$中的半经典角度相关磁电阻振荡（AMRO）和Shubnikov-de Haas效应。我们的数据提供了令人信服的证据磁击穿系统。这表明，一个重建的多连接费米表面持续存在，至少在强磁场，直到超导制度的最高掺杂水平。结果表明，在电子掺杂铜氧化物超导体中，平移对称破缺与超导配对之间存在着密切的联系。
Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering
利用共振非弹性X射线散射（RIXS）在铜$L$吸收边，我们已经观察到强烈的，分散的自旋激发在高度过掺杂的Tl $_2$ Ba $_2$ CuO $_{6+δ}$（超导$T_c =6$ K），一种化合物，其正常状态的电荷传输和热力学性质已被广泛研究，并显示出典型的费米液体行为。补充RIXS实验上稍过掺杂的Tl $_2$ Ba $_2$ CuO $_{6+δ}$（$T_c =89$ K）和Y $_{1-x}$ Ca $_{x}$ Ba $_2$ Cu $_3$ O $_{6+δ}$化合物跨越广泛的掺杂水平表明，这些激发表现出的能量和能量积分光谱权重密切类似的反铁磁振子在未掺杂的铜酸盐。令人惊讶的共存费米液体的电荷激发和高能量的自旋激发，让人想起反铁磁绝缘体在高度过掺杂的化合物提出了挑战，目前的理论模型的铜酸盐。
Incommensurate Antiferromagnetic Order in the Fe-substituted Bi-2201 Cuprate in the Heavily Overdoped Regime
Sophia University（上智大学）；RIKEN Nishina Center（理化学研究所仁科中心）；Institute for Materials Research, Tohoku University（东北大学材料科学研究所）；ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory（STFC卢瑟福阿普顿实验室ISIS脉冲中子与μ子源）；Neutron Scattering Division, Oak Ridge National Laboratory（橡树岭国家实验室中子散射部）；Institute for Solid State Physics, The University of Tokyo（东京大学固体物理研究所）；Department of Natural Sciences, Tokyo Denki University（东京电机大学自然科学系）
Quasiparticle relaxation dynamics in cuprates and lifetimes of low-energy states: Femtosecond data from underdoped to overdoped YBCO and mercury compounds
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。
Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
用软X射线角分辨光电子能谱研究了过掺杂高温超导体La $_{2-x}$ Sr $_x$ CuO $_4$和La $_{1.8-x}$ Eu $_{0.2}$ Sr $_x$ CuO $_4$ .费米面的面内和面外分量通过改变光发射角和入射光子能量来映射。沿波节方向未观察到$k_z$色散，而识别出显著的波腹$k_z$色散。基于紧束缚参数化，我们讨论了范霍夫奇点附近的态密度的影响。我们的研究结果表明，在过掺杂La $_{2-x}$ Sr $_x$ CuO $_4$中发现的大的电子比热不能仅仅归因于van-Hove奇异性。因此，我们提出了量子临界诱导的一个崩溃的赝能隙相作为一个合理的解释所观察到的电子比热增强。
Persistence of vortexlike phase fluctuations in underdoped to heavily overdoped Bi-2201 cuprates
National High Magnetic Field Laboratory, Florida State University（美国国家高磁场实验室）；Western Kentucky University（西肯塔基大学）；Florida State University（佛罗里达州立大学）；Tohoku University（东北大学）
Comment on "Measurement of x-ray absorption spectra of overdoped high-temperature cuprate superconductors: Inapplicability of the single-band Hubbard model"
在最近的一封信中，Peets等人测量了过掺杂La $_{2-x}$ Sr $_x$ CuO $_{4\pmδ}$（LSCO）和Tl $_2$ Ba $_2$ CuO $_{6+δ}$中氧K边处的X射线强度。他们声称，与LSCO和YBa $_2$ Cu $_3$ O $_x$的欠掺杂样品不同，在欠掺杂样品中，积分强度至少随掺杂呈线性增加，但当空穴数超过$x\approx 0.23$时，它会突然饱和。他们将饱和解释为铜酸盐中1-能带哈伯德模型的崩溃。然而，我们表明，他们的结果是在定量协议的1带哈伯德模型。
A Fermi liquid model for the overdoped and optimally doped cuprate superconductors: scattering rate, susceptibility, spin resonance peak and superconducting transition
Magnetic-field-induced enhancement of the vortex pinning in the overdoped regime of La$_{2-x}$Sr$_x$CuO$_4$ : Relation to the microscopic phase separation
为了研究过掺杂高$T_{\rm c}$铜氧化物超导态的不均匀性，我们测量了La $_{2-x}$ Sr $_x$ CuO $_4$（LSCO）单晶在过掺杂区的磁化率$χ$.对于$x$ = 0.198和0.219，发现$χ$在1T中的温度依赖性表现出平台，即在SC状态中，$χ$在中等温度范围内几乎与温度无关。此外，在这些晶体中明显地出现了磁化曲线中的所谓第二峰。这些结果表明，异常增强的涡旋钉扎，并强烈建议发生$microscopic$相分离到SC和正常状态的区域中过掺杂的高$T_{\rm c}$铜酸盐。
