Dramatic evolution of properties with minute change in the doping level is a hallmark of the complex chemistry which governs cuprate superconductivity as manifested in the celebrated superconducting domes as well as quantum criticality taking place at precise compositions. The strange metal state, where the resistivity varies linearly with temperature, has emerged as a central feature in the normal state of cuprate superconductors. The ubiquity of this behavior signals an intimate link between the scattering mechanism and superconductivity. However, a clear quantitative picture of the correlation has been lacking. Here, we report observation of quantitative scaling laws between the superconducting transition temperature $T_{\rm c}$ and the scattering rate associated with the strange metal state in electron-doped cuprate $\rm La_{2-x}Ce_xCuO_4$ (LCCO) as a precise function of the doping level. High-resolution characterization of epitaxial composition-spread films, which encompass the entire overdoped range of LCCO has allowed us to systematically map its structural and transport properties with unprecedented accuracy and increment of $Δx = 0.0015$. We have uncovered the relations $T_{\rm c}\sim(x_{\rm c}-x)^{0.5}\sim(A_1^\square)^{0.5}$, where $x_c$ is the critical doping where superconductivity disappears on the overdoped side and $A_1^\square$ is the scattering rate of perfect $T$-linear resistivity per CuO$_2$ plane. We argue that the striking similarity of the $T_{\rm c}$ vs $A_1^\square$ relation among cuprates, iron-based and organic superconductors is an indication of a common mechanism of the strange metal behavior and unconventional superconductivity in these systems.
Time-reversal symmetry breaking in noncentrosymmetric superconductor Re6Hf:further evidence for unconventional behaviour in the alpha-Mn family of materials
Shear Modulus Anomaly of Unconventional Superconductor in a Symmetry Breaking Field
利用Ginzburg-Landau方法，理论研究了具有多组分序参量的非常规超导体在超导跃迁被破缺场分裂时的等温剪切模量反常.实验签名提出了手征和超导体。特别引人注目的是$C_{66}$在较低的跃迁到超导态时消失了。我们的研究结果可以指导未来的实验，并为材料如Sr $_2$ RuO $_4$和$M_x$ Bi $_2$ Se $_3$提供新的思路。
Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3
报道了硫同位素对BiS 2基超导体Bi 4 O 4S 3转变温度的影响。用32 S和34 S同位素制备了Bi 4 O 4S 3多晶样品。根据磁化分析，同位素指数（aS）估计为-0.1 ≤ aS ≤ 0.1。虽然从电阻率估计的Tc分散相比，从磁化强度估计，我们没有观察到明确的Tc和同位素质量之间的相关性。目前的结果表明，非常规的配对状态是必不可少的Bi 4 O 4S 3。
Unconventional mixed state in the nematic superconductor LiFeAs
CNR-SPIN（意大利国家研究委员会自旋物理研究所）；Division of Mathematics, University of Dundee（邓迪大学数学系）；Maxwell Institute, University of Edinburgh（爱丁堡大学麦克斯韦研究所）；School of Mathematics, University of Leeds（利兹大学数学学院）；Leibniz-Institute for Solid State and Materials Research, IFW-Dresden（德累斯顿IFW莱布尼茨固体与材料研究所）；PSI Center for Neutron and Muon Sciences CNM（瑞士保罗谢尔研究所中子与缪子科学中心）；Laboratorium für Festkörperphysik, ETH Zürich（苏黎世联邦理工学院凝聚态物理实验室）
Correlation between unconventional superconductivity and strange metallicity revealed by operando superfluid density measurements
Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；Fudan University（复旦大学）；Southern University of Science and Technology（南方科技大学）；Harvard University（哈佛大学）；University of Chinese Academy of Sciences（中国科学院大学）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）
Analysis of field-angle dependent specific heat in unconventional superconductors: a comparison between Doppler-shift method and Kramer-Pesch approximation
Paramagnetic Effects on the Vortex Lattice of the Unconventional Superconductor CeCoIn_5
在临界场主要由泡利极限决定，超流主要来自电子自旋与局域磁场的顺磁相互作用的情况下，分析了具有d波配对的高kappa超导体Abrikosov晶格中的磁场分布.在广义Clem变分法框架下得到的结果与CeCoIn_5的形状因子随磁场的增加而增加，然后在接近H_c2时减小的观察结果是一致的。（A. D. Bianchi等人，Science第319卷，177（2008））。
Unconventional pairing originating from disconnected Fermi surfaces in the iron-based superconductor
对于铁基高$T_c$超导体LaFeAsO $_{1-x}$ F $_x$，我们构造了一个极小模型，其中所有的五个Fe $d$带都参与其中.然后，我们研究了超导性的起源与五带随机相位近似通过求解Eliashberg方程。我们得出结论，所产生的自旋波动模式之间的嵌套断开费米口袋实现，基本上，一个扩展的s波配对，其中的间隙改变整个嵌套矢量的符号。
Electronic Transport in Unconventional Superconductors
我们研究了非常规超导体在低温下的电子输运系数，其中电荷和热输运主要由随机晶格缺陷的电子散射决定。讨论了低温热输运中反映的对对称性、费米面和激发谱的特征。对于温度$k_B T \la γ\ll Δ_0$，其中$γ$是杂质诱导的Andreev态的带宽，某些本征值变为{ \it普适}，即，与杂质浓度和相移无关。在超导相（$k_B T \la γ$）的深处，恢复了Wiedemann-Franz定律和索末菲的洛伦兹数值。我们比较了我们的结果与实验的非常规超导体在高温$_c$和重费米子超导体的理论模型。我们的研究结果表明，杂质是一个敏感的探针的低能激发光谱，和零温度极限的输运系数提供了一个重要的测试的序参量对称性。
Unconventional thermoelectric effect in superconductors that break time-reversal symmetry
我们证明了打破时间反演对称性的超导体可以表现出热电性质，这是完全不同于金兹伯格机制。作为一个例子，我们表明，在$s+is$超导状态有一个可逆的贡献，热感生的超电流，其方向是不恒定的下的时间反转操作。而且与Ginzburg机制不同，它在时间反演对称破缺相变附近有奇异行为。该效应可用于确认或排除$s+is$态，这被广泛预期在磷属元素化合物Ba $_{1-x}$ K $_{x}$ Fe $_2$ As $_2$和化学计量的LiFeAs中实现。
