Nguyen D H, Sidorenko A, Taupin M, Knebel G, Lapertot G, Schuberth E, Paschen S
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, Vienna, Austria.
Université Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, Grenoble, France.
Nat Commun. 2021 Jul 21;12(1):4341. doi: 10.1038/s41467-021-24670-z.
Some of the highest-transition-temperature superconductors across various materials classes exhibit linear-in-temperature 'strange metal' or 'Planckian' electrical resistivities in their normal state. It is thus believed by many that this behavior holds the key to unlock the secrets of high-temperature superconductivity. However, these materials typically display complex phase diagrams governed by various competing energy scales, making an unambiguous identification of the physics at play difficult. Here we use electrical resistivity measurements into the micro-Kelvin regime to discover superconductivity condensing out of an extreme strange metal state-with linear resistivity over 3.5 orders of magnitude in temperature. We propose that the Cooper pairing is mediated by the modes associated with a recently evidenced dynamical charge localization-delocalization transition, a mechanism that may well be pertinent also in other strange metal superconductors.
各类材料中一些转变温度最高的超导体在其正常态下表现出与温度呈线性关系的“奇异金属”或“普朗克”电阻率。因此，许多人认为这种行为是解开高温超导秘密的关键。然而，这些材料通常呈现出由各种相互竞争的能量尺度所支配的复杂相图，使得明确识别其中起作用的物理机制变得困难。在这里，我们利用微开尔文温度范围的电阻率测量发现，超导从一种极端奇异金属态凝聚而出，其线性电阻率在温度上跨越超过3.5个数量级。我们提出，库珀对是由与最近证实的动态电荷局域化 - 非局域化转变相关的模式介导的，这种机制很可能在其他奇异金属超导体中也适用。
