The infinite-layer nickelates, isostructural to the high-Tc superconductor cuprates, have risen as a promising platform to host unconventional superconductivity and stimulated growing interests in the condensed matter community. Despite numerous researches, the superconducting pairing symmetry of the nickelate superconductors, the fundamental characteristic of a superconducting state, is still under debate. Moreover, the strong electronic correlation in the nickelates may give rise to a rich phase diagram, where the underlying interplay between the superconductivity and other emerging quantum states with broken symmetry is awaiting exploration. Here, we study the angular dependence of the transport properties on the infinite-layer nickelate Nd0.8Sr0.2NiO2 superconducting films with Corbino-disk configuration. The azimuthal angular dependence of the magnetoresistance (R(ϕ)) manifests the rotational symmetry breaking from isotropy to four-fold (C4) anisotropy with increasing magnetic field, revealing a symmetry breaking phase transition. Approaching the low temperature and large magnetic field regime, an additional two-fold (C2) symmetric component in the R(ϕ) curves and an anomalous upturn of the temperature-dependent critical field are observed simultaneously, suggesting the emergence of an exotic electronic phase. Our work uncovers the evolution of the quantum states with different rotational symmetries and provides deep insight into the global phase diagram of the nickelate superconductors.
Observation of flat-bottom U-shaped energy gap in high-Tc nickelate (La,Pr)3Ni2O7 thin films
Peking University（北京大学）；Hefei National Laboratory（合肥国家实验室）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Boston College（波士顿学院）；Collaborative Innovation Center of Quantum Matter（量子物质协同创新中心）
Limits to the strain engineering of layered square-planar nickelate thin films
层状方形平面镍酸盐，Nd $_{n+1}$ Ni $_{n}$ O $_{2n+2}$，是一个有吸引力的系统，通过维度来调整方形平面镍酸盐的电子性质;事实上，最近在Nd $_{6}$ Ni $_{5}$ O $_{12}$薄膜中观察到了超导性。在这里，我们调查的作用，外延应变的竞争要求的$n=3$ Ruddlesden-Popper化合物的合成，钕$_{4}$镍$_{3}$ O $_{10}$，随后减少到正方形平面相，钕$_{4}$镍$_{3}$ O $_{8}$。我们在LaAlO $_{3}$（001）上合成了最高质量的Nd $_{4}$ Ni $_{3}$ O $_{10}$薄膜，而在NdGaO $_{3}$（110）上合成的Nd $_{4}$ Ni $_{3}$ O $_{10}$薄膜表现出拉伸应变诱导的岩盐断层，但保留了块状输运性质。在SrTiO $_{3}$（001）上的Nd $_{4}$ Ni $_{3}$ O $_{10}$中形成高密度的扩展缺陷。在LaAlO $_{3}$上还原的膜变成绝缘的并且形成压缩应变诱导的$c$轴倾斜缺陷，而在NdGaO $_{3}$上的Nd $_{4}$ Ni $_{3}$ O $_{8}$膜是金属的。这项工作提供了一种途径，以合成的Nd $_{n+1}$镍$_{n}$ O $_{2n+2}$薄膜，并设置限制的能力，应变工程师通过外延这些化…
Electronic structures across superconductor-insulator transition in Ruddlesden-Popper bilayer nickelate films
University of Science and Technology of China（中国科学技术大学）；Hefei National Laboratory, University of Science and Technology of China（合肥国家实验室，中国科学技术大学）；Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China（微观尺度物理科学合肥国家研究中心，中国科学技术大学）；Southern University of Science and Technology（南方科技大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Nanjing University（南京大学）；Shanghai Jiao Tong University（上海交通大学）；Tsinghua University（清华大学）
Time-reversal symmetry breaking superconductivity with electronic glass in nickelate (La, Pr, Sm)3Ni2O7 films
Peking University（北京大学）；Southern University of Science and Technology（南方科技大学）；Renmin University of China（中国人民大学）；ShanghaiTech University（上海科技大学）；Boston College（波士顿学院）；Tsinghua University（清华大学）
Observation of Josephson-like tunneling junction characteristics and positive magnetoresistance in Oxygen deficient Nickelate films of $Nd_{0.8}Sr_{0.2}NiO_{3-δ}$
Achieving superconductivity in infinite-layer nickelate thin films by aluminum sputtering deposition
Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay（阿尔伯特·费尔特实验室，法国国家科学研究中心，泰雷兹集团，巴黎萨克雷大学）；Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay（固体物理实验室，法国国家科学研究中心，巴黎萨克雷大学）；Synchrotron SOLEIL（索莱尔同步辐射中心）
High-field-stabilized reentrant superconductivity in infinite-layer nickelate thin films
National High Magnetic Field Laboratory, Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室高磁场实验室）；Department of Physics, Faculty of Science, National University of Singapore（新加坡国立大学理学院物理系）；Center for Integrated Nanotechnologies, Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室集成纳米技术中心）；Department of Physics, Faculty of Science and Technology, Universitas Airlangga（艾尔朗加大学理学院物理系）；Singapore Synchrotron Light Source (SSLS), National University of Singapore（新加坡国立大学新加坡同步辐射光源）；Department of Physics, The Chinese University of Hong Kong（香港中文大学物理系）
Preparation and optimization of high-temperature superconducting Ruddlesden-Popper nickelate thin films
Southern University of Science and Technology（南方科技大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Tsinghua University（清华大学）
Thermodynamic phase transition, pairing symmetry and Fermi surface topology in Ruddlesden-Popper nickelate films
University of Science and Technology of China（中国科学技术大学）；Hefei National Laboratory, University of Science and Technology of China（合肥国家实验室，中国科学技术大学）；Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China（中国科学院微观结构国家重点实验室，中国科学技术大学）
Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
Southern University of Science and Technology（南方科技大学）；University of Science and Technology of China（中国科学技术大学）；Shanghai Jiao Tong University（上海交通大学）；Tsinghua University（清华大学）
From perovskite to infinite-layer nickelates: hole concentration from x-ray absorption
Max Planck Institute for Solid State Research（马克斯·普朗克固体研究所）；Universite de Strasbourg, CNRS, IPCMS UMR 7504（斯特拉斯堡大学）；Helmholtz-Zentrum Berlin für Materialien und Energie（柏林亥姆霍兹材料与能源中心）；European Synchrotron Radiation Facility（欧洲同步辐射装置）；Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院）
Enhanced superconductivity in the compressively strained bilayer nickelate thin films by pressure
Nanjing University（南京大学）；Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Ruhr-University Bochum（波鸿鲁尔大学）
Three-Dimensional Electronic Structures in Superconducting Ruddlesden-Popper Bilayer Nickelate Films
Southern University of Science and Technology（南方科技大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；University of Science and Technology of China（中国科学技术大学）；Shanghai Jiao Tong University（上海交通大学）；Tsinghua University（清华大学）
Selective suppression of electronic orders via interlayer coupling in superconducting bilayer nickelate thin films
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；University of Chinese Academy of Sciences（中国科学院大学）；Department of Physics, The Chinese University of Hong Kong（香港中文大学物理系）；Hefei National Laboratory（合肥国家实验室）；Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器）；State Key Laboratory of Quantum Information Technologies and Materials, The Chinese University of Hong Kong（香港中文大学量子信息技术与材料国家重点实验室）
Superconductivity onset above 60 K in ambient-pressure nickelate films
Southern University of Science and Technology（南方科技大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；Shanghai Jiao Tong University（上海交通大学）；Tsinghua University（清华大学）
Emergent quantum phenomena via phase-coherence engineering in infinite-layer nickelate superconductors
Peking University（北京大学）；University of Electronic Science and Technology of China（电子科技大学）；Renmin University of China（中国人民大学）；ShanghaiTech University（上海科技大学）；Tsinghua University（清华大学）；Institute of Physics Chinese Academy of Sciences（中国科学院物理研究所）；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 Normal University（北京师范大学）；Fudan University（复旦大学）；Hefei National Laboratory（合肥国家实验室）
Persistent structural distortions and absent superconductivity in trilayer nickelate thin films
John A. Paulson School of Engineering and Applied Sciences, Harvard University（哈佛大学生物工程与应用科学学院）；Department of Physics, Harvard University（哈佛大学物理系）；Department of Electrical Engineering & Computer Science, Massachusetts Institute of Technology（麻省理工学院电气与计算机科学系）；School of Applied & Engineering Physics, Cornell University（康奈尔大学应用与工程物理学院）；Department of Physics, Arizona State University（亚利桑那州立大学物理系）；Cornell High Energy Synchrotron Source, Cornell University（康奈尔大学高能同步辐射光源）；Advanced Photon Source, Argonne National Laboratory（阿贡国家实验室先进光子源）
