Superconductivity in an extreme strange metal

D. H. Nguyen, A. Sidorenko, M. Taupin, G. Knebel, G. Lapertot, E. Schuberth and S. Paschen ()
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D. H. Nguyen: Vienna University of Technology
A. Sidorenko: Vienna University of Technology
M. Taupin: Vienna University of Technology
G. Knebel: Université Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS
G. Lapertot: Université Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS
E. Schuberth: Technische Universität München
S. Paschen: Vienna University of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-24670-z

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