Speaker
Description
High-temperature superconductivity in cuprates is achieved through doping Mott insulators, but the critical process underlying the emergence of superconductivity remains unclear. Combining high-resolution resonant inelastic X-ray scattering (RIXS) and scanning tunneling microscopy (STM), we have investigated Bi2Sr2(Ca,Dy)Cu2O8+δ near the onset of the superconducting dome. Our results indicate that Cooper pairs grow out of a charge-ordered insulating state and condense accompanied by an enhanced interplay between charge excitations and electron-phonon coupling [1]. While charge orders (CO) are considered a significant competitor of high-temperature superconductivity in underdoped cuprates, overdoped cuprates have traditionally been viewed as conventional Fermi liquids without collective electronic order. Using Cu L3 edge and O K edge RIXS, we have revealed the presence of CO in overdoped La2-xSrxCuO4 beyond the superconducting dome [2]. Our results suggest that CO is prevalent in the overdoped metallic regime, requiring a reassessment of the traditional understanding of overdoped cuprates as weakly correlated Fermi liquids.
References
1. C. Zou et al., Evolution from a charge-ordered insulator to a high-temperature superconductor in Bi2Sr2(Ca,Dy)Cu2O8+δ, Nature Communications 15, 7739 (2024).
2. Q. Li et al., Prevailing charge order in overdoped cuprates beyond the superconducting dome, Physical Review Letters 131, 116002 (2023).
| Field of Condensed Matter | Superconductivity |
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