Evolution from a Charge-ordered Insulator to a High-temperature Superconductor in BiSr(Ca,Dy)CuO

Overview

Journal Nat Commun

Specialty Biology

Date 2024 Sep 4

PMID 39231956

Authors

Changwei Zou

Jaewon Choi

Qizhi Li

Shusen Ye

Chaohui Yin

Mirian Garcia-Fernandez

Stefano Agrestini

Qingzheng Qiu

Xinqiang Cai

Qian Xiao

Xingjiang Zhou

Ke-Jin Zhou

Yayu Wang

Yingying Peng

Affiliations

Soon will be listed here.

Abstract

How Cooper pairs form and condense has been the main challenge in the physics of copper-oxide high-temperature superconductors. Great efforts have been made in the 'underdoped' region of the phase diagram, through doping a Mott insulator or cooling a strange metal. However, there is still no consensus on how superconductivity emerges when electron-electron correlations dominate and the Fermi surface is missing. To address this issue, here we carry out high-resolution resonant inelastic X-ray scattering and scanning tunneling microscopy studies on prototype cuprates BiSrCaDyCuO near the onset of superconductivity, combining bulk and surface, momentum- and real-space information. We show that an incipient charge order exists in the antiferromagnetic regime down to 0.04 holes per CuO unit, entangled with a particle-hole asymmetric pseudogap. The charge order induces an intensity anomaly in the bond-buckling phonon branch, which exhibits an abrupt increase once the system enters the superconducting dome. Our results suggest that the Cooper pairs grow out of a charge-ordered insulating state, and then condense accompanied by an enhanced interplay between charge excitations and electron-phonon coupling.

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