Coherent organization of electronic correlations as a mechanism to enhance and stabilize high-T C cuprate superconductivity

Haoxiang Li (), Xiaoqing Zhou, Stephen Parham, Theodore J. Reber, Helmuth Berger, Gerald B. Arnold and Daniel S. Dessau ()
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Haoxiang Li: University of Colorado at Boulder
Xiaoqing Zhou: University of Colorado at Boulder
Stephen Parham: University of Colorado at Boulder
Theodore J. Reber: University of Colorado at Boulder
Helmuth Berger: École Polytechnique Fédérale de Lausanne
Gerald B. Arnold: University of Colorado at Boulder
Daniel S. Dessau: University of Colorado at Boulder

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Strong diffusive or incoherent electronic correlations are the signature of the strange-metal normal state of the cuprate superconductors, with these correlations considered to be undressed or removed in the superconducting state. A critical question is if these correlations are responsible for the high-temperature superconductivity. Here, utilizing a development in the analysis of angle-resolved photoemission data, we show that the strange-metal correlations don’t simply disappear in the superconducting state, but are instead converted into a strongly renormalized coherent state, with stronger normal state correlations leading to stronger superconducting state renormalization. This conversion begins well above T C at the onset of superconducting fluctuations and it greatly increases the number of states that can pair. Therefore, there is positive feedback––the superconductive pairing creates the conversion that in turn strengthens the pairing. Although such positive feedback should enhance a conventional pairing mechanism, it could potentially also sustain an electronic pairing mechanism.

Date: 2018
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DOI: 10.1038/s41467-017-02422-2

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