Motivated by the presence of an extremely small electron pocket in the electronic band structure of infinite-layer (IL) nickelate superconductors, we systematically explore the superconducting (SC) properties of a two-dimensional Hubbard model influenced by an additional conduction band with small occupancy (dry Fermi sea). Our dynamic cluster quantum Monte Carlo calculations demonstrated the unusual impact of this additional dry metallic layer, which shifts the SC dome of the correlated Hubbard layer towards the overdoped regime, namely the $d$-wave SC can be enhanced (suppressed) in the overdoped (underdoped) regime. Simultaneously, the pseudogap (PG) crossover line shifts to the same higher doping regime as well. Our analysis revealed the interplay of the effective pairing interaction, pair-field susceptibility, and antiferromagnetic spin fluctuation in the underlying non-monotonic physics. We postulate on the physical picture of SC dome shift in terms of the Kondo-type electron-hole binding in the case of a dry additional conduction band. Our investigation provided valuable new insights on tuning the SC properties via external dry bands.
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)
Observation of room-temperature spontaneous phase segregation in overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}
用高灵敏度交流磁强计测量了{ \rm Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+x}$ }单晶的超导转变花样,研究了其相不均匀性的发生和发展。我们发现,过掺杂的{ \rm Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+x}$ }单晶,即使它们是单相后,立即高温退火过程,显示出逐渐明显的多个超导转变随着时间的推移,因为它们被保持在室温下在干燥的空气气氛中。结果表明,晶体中的氧掺杂剂在室温下仍然是可移动的。这些掺杂剂倾向于重新排列,从而在一周或两周左右的特征时间尺度上形成不同的相。此外,在新的隔离相的抗磁化循环是非常弱的,大概是由于存在额外的不均匀性下降到纳米尺度。我们的研究结果还表明,最佳掺杂的{ \rm Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+x}$ }晶体似乎能够保持在一个单一的阶段随着时间的推移。
A Symmetric Superconducting Dome Hosts Non-Fermi Liquid Behavior at Optimal Doping in MoS2
MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, National Gravimetry Laboratory and School of Physics, Huazhong University of Science and Technology(华中科技大学物理学院);Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(粤港澳大湾区量子科学中心);Institute for Quantum Science and Engineering, Huazhong University of Science and Technology(华中科技大学量子科学与工程研究院);Centre for Advanced Laser Techniques, Institute of Physics, Zagreb(萨格勒布物理研究所先进激光技术研究中心);College of Science, Guizhou Institute of Technology(贵州理工学院理学院);State Key Laboratory of Micro-nano Engineering Science, Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学李政道研究所微纳工程科学国家重点实验室);Shanghai Research Center for Quantum Sciences(上海量子科学研究中心);Department of Physics, The University of Hong Kong(香港大学物理系)
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。
Local measurement of the superfluid density in the pnictide superconductor Ba(Fe$_{1-x}$Co$_{x}$)$_2$As$_2$ across the superconducting dome
我们使用局部技术测量Ba(Fe $_{1-x}$ Co $_{x}$)$_2$ As $_2$中的渗透深度$λ_{ab}(T)$,该技术不对样品求平均值。超流密度$ρ_s(T)\equiv1/λ_{ab}(T)^2$具有三个主要特征。首先,$ρ_s(T=0)$在圆顶的欠掺杂侧急剧下降。第二,$λ_{ab}(T)$在最佳掺杂下在低$T$下是平坦的,表明完全带隙的超导性,但在欠掺杂和过掺杂样品中变化更强烈,与幂律或小的第二间隙一致。第三,$ρ_s(T)$在$T_c$附近急剧变化以获得最佳掺杂和欠掺杂。这些观察结果与磁相和超导相之间的相互作用是一致的。
Specific heat across the superconducting dome in the cuprates
在整个相图上计算了超导铜氧化物的比热。基于费米液体的大费米面和能带结构理论的d波BCS方法提供了对过掺杂区域的良好描述。在欠掺杂,它是必不可少的,包括出现的第二个能量标度,赝能隙及其相关的Gutzwiller因子,这占减少的相干件的电子格林函数由于增加的相关性,作为莫特绝缘状态接近。与实验结果相一致,我们发现低温比热随温度变化的线性斜率在最佳掺杂浓度以上迅速增加,而在最佳掺杂浓度以下几乎不变。我们的理论计算也同意最近的数据Bi $_2$ Sr $_{2-\rm x}$ La $_{\rm x}$ CuO $_{6+δ}$的正常状态是通过一个大的磁场的应用程序访问。量子临界点位于略低于最佳掺杂处。
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)
High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry
Institute of Crystallography, National Research Council, CNR(意大利国家研究委员会晶体学研究所);Rome International Center for Materials Science Superstripes RICMASS(罗马国际材料科学超晶格RICMASS中心);Department of Industrial, Electronic and Mechanical Engineering, Roma Tre University(罗马第三大学工业、电子与机械工程系);Istituto Nazionale di Fisica Nucleare INFN, Sezione Roma Tre(意大利核物理研究所INFN罗马三分部);National High Magnetic Field Laboratory (NHMFL), Florida State University (FSU)(佛罗里达州立大学国家高磁场实验室);National High Magnetic Field Laboratory (NHMFL), Los Alamos National Laboratory (LANL)(洛斯阿拉莫斯国家实验室国家高磁场实验室);Max Planck Institute for Solid State Research(马克斯·普朗克固体研究所)
Electron doping evolution of the neutron spin resonance in NaFe$_{1-x}$Co$_{x}$As
中子自旋共振,一种与超导性相耦合的集体磁激发,是包括氧化铜、铁磷属元素化物和重费米子在内的广泛的非常规超导体家族所共有的最突出的特征之一。在这项工作中,我们研究的掺杂演变的共振NaFe $_{1-x}$ Co $_x$ As覆盖整个超导圆顶。对于欠掺杂的组合物,两种共振模式共存。随着掺杂的增加,低能量共振逐渐失去其光谱权重的高能量,但仍然在相同的能量。相比之下,在过掺杂状态中,我们仅发现一个单一共振,其在能量和动量两者中获得更宽的宽度,但即使当与最佳掺杂相比$T_c$下降近一半时也保持大致相同的峰位置。这些结果表明,电子过掺杂NaFe $_{1-x}$ Co $_x$ As的共振能量既不与$T_c$成简单的正比,也不与超导能隙成简单的正比,而是受系统的多轨道特性和掺杂杂质散射效应的控制.
Superconducting dome and field-enhanced superconductivity of PLD synthesized Nd1-xEuxNiO2 thin films
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所,北京凝聚态物理国家研究中心);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);Key Laboratory of Multiscale Spin Physics, Ministry of Education, Beijing Normal University(北京师范大学多尺度自旋物理教育部重点实验室)
Superconducting dome due to the Fano-Feshbach shape resonance in artificial high-Tc superlattices
Institute of Crystallography, National Research Council, CNR(意大利国家研究委员会晶体学研究所);Rome International Center for Materials Science Superstripes RICMASS(罗马国际材料科学超条纹研究中心 RICMASS);Department of Industrial, Electronic and Mechanical Engineering, Roma Tre University(罗马第三大学工业、电子和机械工程系);Istituto Nazionale di Fisica Nucleare INFN, Sezione Roma Tre(意大利国家核物理研究所罗马三分部);National High Magnetic Field Laboratory (NHMFL), Los Alamos National Laboratory (LANL)(洛斯阿拉莫斯国家实验室国家高磁场实验室);Laboratoire National des Champs Magnétiques Intenses(强磁场国家实验室);Department of Physics and Astronomy, Baylor University(贝勒大学物理与天文系);CQM group, School of Pharmacy, Physics Unit, University of Camerino(卡梅里诺大学药学院物理学单元量子物质小组);Department of Physics, Sapienza University(罗马第一大学物理系);Max Planck Institute for Solid State Research(马克斯·普朗克固体研究所)
Condensation, excitation, pairing, and superfluid density in high-$T_{c}$ superconductors: magnetic resonance mode as a roton analogue and a possible spin-mediated pairing
Role of multiband effects and electron-hole asymmetry in the superconductivity and normal state properties of Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$
本文系统地研究了Ba(Fe $_{1-x}$ Co $_{x}$)$_{2}$ As $_{2}$在宽掺杂范围内的电阻率和霍尔效应。我们发现了一个令人惊讶的巨大差距之间的弛豫率的空穴和电子,超过一个数量级的低掺杂,低温制度。电子与空穴迁移率的比率随着温度和掺杂(远离磁有序状态)而减小,并且变得更加常规。我们还发现了一个简单的解释大的不对称性(相比铜酸盐)的超导圆顶:在欠掺杂制度的决定性因素是AF和超导性(SC)之间的竞争,而在过掺杂制度的主要作用是发挥退化的嵌套,削弱配对相互作用。结果表明,带间电子-空穴散射引起的自旋涨落不仅在超导配对中起着重要作用,而且在正常输运中也起着重要作用。