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Article Abstract
The microscopic mechanism for the disappearance of superconductivity in overdoped cuprates is still under heated debate. Here we use scanning tunneling spectroscopy to investigate the evolution of quasiparticle interference phenomenon in BiSrCuO over a wide range of hole densities. We find that when the system enters the overdoped regime, a peculiar quasiparticle interference wavevector with arc-like pattern starts to emerge even at zero bias, and its intensity grows with increasing doping level. Its energy dispersion is incompatible with the octet model for d-wave superconductivity, but is highly consistent with the scattering interference of gapless normal carriers. The gapless quasiparticles are mainly located near the antinodes and are independent of temperature, consistent with the disorder scattering mechanism. We propose that a branch of normal fluid emerges from the pair-breaking scattering between flat antinodal bands in the quantum ground state, which is the primary cause for the reduction of superfluid density and suppression of superconductivity in overdoped cuprates.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11164957 | PMC |
| http://dx.doi.org/10.1038/s41467-024-49325-7 | DOI Listing |
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Article Synopsis
- - The disappearance of superconductivity in overdoped cuprates is debated, and this study uses scanning tunneling spectroscopy to explore quasiparticle interference in BiSrCuO at varying hole densities.
- - As doping increases, a unique arc-like quasiparticle interference pattern develops, even at zero bias, indicating a shift in behavior incompatible with traditional models of d-wave superconductivity.
- - The findings suggest that a new type of normal fluid arises from particle interactions, leading to a decrease in superfluid density and a suppression of superconductivity in overdoped cuprates.
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