Jacob P. Ruf, Hanjong Paik, Nathaniel J. Schreiber, Hari P. Nair, Ludi Miao, Jason K. Kawasaki, Jocienne N. Nelson, Brendan D. Faeth, Yonghun Lee, Berit H. Good… 展开作者
Jacob P. Ruf, Hanjong Paik, Nathaniel J. Schreiber, Hari P. Nair, Ludi Miao, Jason K. Kawasaki, Jocienne N. Nelson, Brendan D. Faeth, Yonghun Lee, Berit H. Goodge, Betül Pamuk, Craig J. Fennie, Lena F. Kourkoutis, Darrell G. Schlom, Kyle M. Shen
Superconductivity is among the most fascinating and well-studied quantum states of matter. Despite over 100 years of research, a detailed understanding of how features of the normal-state electronic structure determine superconducting properties has remained elusive. For instance, the ability to deterministically enhance the superconducting transition temperature by design, rather than by serendipity, has been a long sought-after goal in condensed matter physics and materials science, but achieving this objective may require new tools, techniques and approaches. Here, we report the first instance of the transmutation of a normal metal into a superconductor through the application of epitaxial strain. We demonstrate that synthesizing RuO$_{2}$ thin films on (110)-oriented TiO$_{2}$ substrates enhances the density of states near the Fermi level, which stabilizes superconductivity under strain, and suggests that a promising strategy to create new transition-metal superconductors is to apply judiciously chosen anisotropic strains that redistribute carriers within the low-energy manifold of $d$ orbitals.
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）
Pressure-induced superconductivity in epitaxially-stabilized Pr$_3$Ni$_2$O$_7$ films
The University of Tokyo（东京大学）；RIKEN Center for Emergent Matter Science (CEMS)（理化学研究所新兴物质科学中心）；Institute for Materials Research (IMR), Tohoku University（东北大学物质材料研究机构）；Advanced Institute for Materials Research (WPI-AIMR), Tohoku University（东北大学先进物质材料研究机构）；Tokyo College, The University of Tokyo（东京大学东京学院）
In-Plane Ni-O-Ni Bond Angles as Structural Fingerprints of Superconductivity in Layered Nickelates: Effects of Pressure, Strain, Layering, and Correlations
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）
Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
Toyota Riken–Kyoto University Research Center (TRiKUC)（丰田理研-京都大学研究中心）；Department of Electronic Science and Engineering, Graduate School of Engineering, Kyoto University（京都大学工学研究科电子科学工程系）；Department of Physics, Indian Institute of Technology Kanpur（坎普尔印度理工学院物理系）；Irving K. Barber Faculty of Science, University of British Columbia（不列颠哥伦比亚大学欧文·K·巴伯理学院）；Institute for Theoretical Physics, ETH Zürich（苏黎世联邦理工学院理论物理研究所）
Strain-Induced Helical Superconductivity and the Zero-Field Diode Effect
Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院凝聚态理论研究所）；Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院量子材料与技术研究所）
Strain-driven nematicity of the odd-parity superconductivity in Sr$_x$Bi$_2$Se$_3$
我们提出了一个新的实验证据，在掺杂的拓扑绝缘体Sr $_x$ Bi $_2$ Se $_3$的高质量单晶奇宇称超导性。X射线衍射分析表明，生长的单晶体在基面内沿晶轴之一有弱的拉伸或单轴压缩。我们表明，在超导状态下，上临界磁场$H_{c2}$具有双重旋转对称性，并取决于应变的符号：在拉伸的样品中，最大的$H_{c2}$时，实现面内磁场是横向于应变轴，而在压缩的样品中观察到这个最大值时，该字段是沿应变方向。这一结果自然解释的奇宇称超导耦合到应变的框架内。正常状态下的磁电阻与电流方向无关，并且具有双重旋转对称性，这证明了正常状态下电子系统的向列性。
Unifying Strain-driven and Pressure-driven Superconductivity in La$_{3}$Ni$_{2}$O$_{7}$: Suppressed charge/spin density waves and enhanced interlayer coupling
Strain-driven attenuation of superconductivity in heteroepitaxial perovskite/YBCO/perovskite thin films
为了区分应变和磁性对$c$轴$_{2/3}$ Ca $_{1/3}$ MnO $_3$ /YBa $_2$ Cu $_3$ O $_{7-δ}$（LCMO/YBCO）异质结构中超导电性的影响，我们研究了使用铁磁LCMO或顺磁LaNiO $_3$（LNO）作为钙钛矿的钙钛矿/YBCO/钙钛矿薄膜。对于晶格对称匹配的比较，我们还使用正交PrBa $_2$ Cu $_3$ O $_{7-δ}$（PBCO）代替伪立方钙钛矿。与PBCO/YBCO/PBCO不同的是，当YBCO层厚度从21.4 nm减小到5.4 nm时，LCMO/YBCO/LCMO和LNO/YBCO/LNO三层都表现出超导$T_c$的强烈衰减。我们的研究结果表明，异质外延应变，而不是长程邻近效应，是负责长的长度尺度的$T_c$衰减观察到的$c$轴LCMO/YBCO异质结构。
Nearly perfect Fermi surface nesting in hole-doped La$_3$Ni$_2$O$_7$ enables bulk superconductivity without pressure or strain
NYU-ECNU Institute of Physics, NYU Shanghai（纽约大学-华东师范大学物理研究所，上海纽约大学）；Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University（华东师范大学极化材料与器件教育部重点实验室）；Department of Physics, Brown University（布朗大学物理系）；Department of Physics, New York University（纽约大学物理系）
Superconductivity in spinel oxide LiTi2O4 epitaxial thin films
LiTi 2 O 4是一种独特的材料，因为它是唯一已知的氧化物尖晶石超导体。虽然体材料研究已经表明超导性可以用Bardeen-Cooper-Schreiffer理论来描述，但是超导性的微观机制还没有完全解决。超导性能对尖晶石晶体结构的各种缺陷的敏感性提供了对这种机制的深入了解。在MgAl 2 O 4、MgO和SrTiO 3单晶衬底上的LiTi 2 O 4外延膜提供了系统地探索晶格应变和微结构无序的影响的模型系统。影响带宽的晶格应变引起超导和正常状态性质的有限变化。微结构无序如反相晶界引起的Ti网络无序可降低临界温度，但Ti网络无序与Mg互扩散相结合对超导态的影响更为显著。厚度相关的运输研究表明，超导体-绝缘体的转变作为膜厚度的函数，而不管晶格应变和微观结构。此外，表面敏感的X射线吸收光谱已确定Ti保留站点对称性和平均价的散装材料，而不管膜厚度。
Strain induced superconductivity in the parent compound BaFe2As2
在SrTiO_3衬底上生长的单层FeSe（体相Tc =8K）薄膜中发现了转变温度高达65K的超导电性（SC），引起了人们对铁基薄膜的特别关注。高Tc是从氧空位衬底到FeSe薄膜的电子转移和晶格拉伸应变的组合效应的结果。在这里，我们证明了SC的实现在母体化合物BaFe2As2（没有散装Tc）只是通过拉伸晶格应变没有电荷掺杂。研究了在Fe缓冲MgAl 2 O 4单晶衬底上外延BaFe 2 As 2薄膜中应变与SC之间的相互作用。Fe和FeAs亚晶格之间的强界面键合增加了由于晶格失配导致的反铁磁自旋密度波的抑制，并诱导SC与体Tc？一万这些结果突出了结构变化在控制铁基超导体相图中的作用。
