In this letter, we report that the superconductivity transition temperature in beta-Fe1.01Se increases from 8.5 to 36.7 K under applied pressure of 8.9 GPa. It then decreases at higher pressure. A dramatic change in volume is observed at the same time Tc rises, due to a collapse of the separation between the Fe2Se2 layers. A clear transition to a linear resistivity normal state is seen on cooling at all pressures. No static magnetic ordering is observed for the whole p-T phase diagram. We also report that at higher pressure (starting around 7 GPa and completed at 38 GPa), Fe1.01Se transforms to a hexagonal NiAs-type structure and displays non-magnetic, insulating behavior. The inclusion of electron correlation in band structure caculations is necessary to describe this behavior, signifying that such correlations are important in this chemical system. Our results strongly support unconventional superconductivity in beta-Fe1.01Se.
Interplay of ferroelectricity and interlayer superconductivity in van der Waals bilayers
L. D. Landau Institute for Theoretical Physics（列夫·朗道理论物理研究所）；Moscow Institute of Physics and Technology (National Research University)（莫斯科物理技术学院（国立研究大学））；National University of Science and Technology “MISIS”（国立科技大学“MISIS”）；Institute for Physics of Microstructures, Russian Academy of Sciences（俄罗斯科学院微观结构物理研究所）
Strongly enhanced superconductivity due to finite energy spin fluctuations induced by an incipient band : a FLEX study on the bilayer Hubbard model with vertical and diagonal interlayer hoppings
Interlayer electronic coherence links magnetism and superconductivity in Ruddlesden-Popper nickelates
State Key Laboratory of Surface Physics and Department of Physics, Fudan University（复旦大学表面物理国家重点实验室和物理系）；Shanghai Research Center for Quantum Sciences（上海量子科学研究中心）；Institute of Nanoelectronics and Quantum Computing, Fudan University（复旦大学纳米电子与量子计算研究所）
Unifying Strain-driven and Pressure-driven Superconductivity in La$_{3}$Ni$_{2}$O$_{7}$: Suppressed charge/spin density waves and enhanced interlayer coupling
University of Chinese Academy of Sciences（中国科学院大学）；Chinese Academy of Sciences（中国科学院）；Beihang University（北京航空航天大学）
Charge stripe and superconductivity tuned by interlayer interaction in a sign-problem-free bilayer extended Hubbard model
School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院）；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）；School of Physics and Institute for Advance Study in Physics, Zhejiang University（浙江大学物理学院及物理高等研究院）
Superconductivity at Pd/Bi$_2$Se$_3$ Interfaces Due to Self-Formed PdBiSe Interlayers
Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University（天津大学理学院物理系联合量子研究中心）；Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Physics, Tianjin University（天津大学物理系低维材料物理与制备技术天津市重点实验室）；Beijing Advanced Innovation Center for Intelligent Robots and Systems, School of Medical Technology, Beijing Institute of Technology（北京理工大学医疗技术学院北京市智能机器人系统先进创新中心）；Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology（北京理工大学物理学院光电量子架构与测量教育部重点实验室量子物理中心）
Intrinsic high-temperature superconductivity in ternary iron selenides
本文研究了三元铁硒化物KPDMATHABMM Fe $_{2-x}$ Se $_{2}$在介观混合反铁磁（AF）和超导（SC）相中的超导电性。结果表明，层间跳跃和AF阶数是决定SC相$T_{c}$的关键因素。一般来说，跳跃会产生变形的费米面（FS），这往往会抑制超导性。然而，与通常的预期相反，我们发现较大的AF阶数实际上导致较大的SC阶数，这解释了在这些相位中观察到的相对较高的$T_{c}$。此外，我们的研究结果表明，通过适当地减少层间跳跃，相分离的K $_{y}$ Fe $_{2-x}$ Se $_{2}$可以表现出其固有的SC相在二维极限与更高的$T_{c}$（$\sim 65K$）比已经观察到的。
Transition from $s_{\pm}$-wave to $d_{x^{2}-y^{2}}$-wave superconductivity driven by interlayer interaction in the bilayer two-orbital model of La$_3$Ni$_2$O$_7$
Dissecting superconductivity in the Ruddlesden-Popper nickelates: The role of electron correlation and interlayer magnetic exchange
Diamond Light Source（钻石光源）；National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China（中国科学技术大学核科学与技术学院/国家同步辐射实验室）；Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University（中山大学物理学院/广东省铁电与磁器件重点实验室）；Department of Physics, University of Oxford（牛津大学物理系）；National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University（南京大学固体微结构物理国家重点实验室/物理学院）；Collaborative Innovation Center of Advanced Microstructures, Nanjing University（南京大学先进微结构协同创新中心）
Competing Interlayer Loop Currents and Superconductivity in the Bilayer $t$-$J_\perp$-$V$ Model
Facultad de Ciencias Exactas, Ingeniería y Agrimensura（理学院、工程学院和测量学院）；Instituto de Física Rosario (UNR-CONICET)（罗萨里奥物理研究所（UNR-CONICET））；Department of Physics, Nagoya University（名古屋大学物理学系）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；Max Planck Institute for Solid State Research（马克斯·普朗克固体研究所）
Time-reversal symmetry breaking superconductivity in the presence of loop-current fluctuations
School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院）；Key Laboratory of Multiscale Spin Physics (Beijing Normal University), Ministry of Education（教育部多尺度自旋物理重点实验室（北京师范大学））；Beijing Computational Science Research Center（北京计算科学研究中心）；New Cornerstone Science Laboratory, Department of Physics, School of Science, Westlake University（西湖大学理学院物理系新基石科学实验室）；Institute for Theoretical Sciences, Westlake University（西湖大学理论科学研究院）；Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University（西湖大学理学院浙江省量子材料重点实验室）；Institute of Natural Sciences, Westlake Institute for Advanced Study（西湖高等研究院自然科学研究院）
