Unveiling phase diagram of the lightly doped high-Tc cuprate superconductors with disorder removed

Abstract

The currently established electronic phase diagram of cuprates is based on a study of single- and double-layered compounds. These CuO${}_2$ planes, however, are directly contacted with dopant layers, thus inevitably disordered with an inhomogeneous electronic state. Here, we solve this issue by investigating a 6-layered Ba${}_2$Ca${}_5$Cu${}_6$O${}_{12}$(F,O)${}_2$ with inner CuO${}_2$ layers, which are clean with the extremely low disorder, by angle-resolved photoemission spectroscopy (ARPES) and quantum oscillation measurements. We find a tiny Fermi pocket with a doping level less than 1% to exhibit well-defined quasiparticle peaks which surprisingly lack the polaronic feature. This provides the first evidence that the slightest amount of carriers is enough to turn a Mott insulating state into a metallic state with long-lived quasiparticles. By tuning hole carriers, we also find an unexpected phase transition from the superconducting to metallic states at 4%. Our results are distinct from the nodal liquid state with polaronic features proposed as an anomaly of the heavily underdoped cuprates.

References in corpus (9)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
• Phase competition in trisected superconducting dome
• Point nodes persisting far beyond Tc in Bi2212
• Imaging nanoscale Fermi surface variations in an inhomogeneous superconductor
• Observation of small Fermi pockets protected by clean CuO2 sheets of a high-Tc superconductor
• Competition between antiferromagnetism and superconductivity, electron-hole doping asymmetry and "Fermi Surface" topology in cuprates
• Multilayered cuprate superconductor Ba${}_2$Ca${}_5$Cu${}_6$O${}_{12}$(O${}_{1-x}$,F${}_x$)${}_2$ studied by temperature-dependent scanning tunneling microscopy and spectroscopy

Cited by in corpus (10)

• Ab initio quantum many-body description of superconducting trends in the cuprates
• Feshbach hypothesis of high-Tc superconductivity in cuprates
• On the cuprates' universal waterfall feature: evidence of a momentum-driven crossover
• Scattering theory of mesons in doped antiferromagnetic Mott insulators: Multichannel perspective and Feshbach resonance
• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• Fractionalized Fermi liquids and the cuprate phase diagram
• Geometric orthogonal metals: Hidden antiferromagnetism and pseudogap from fluctuating stripes
• Ternary nickel hydrides: a new platform for unconventional superconductivity and quantum magnetism
• BCS-BEC crossover driven by small Fermi pockets of a high-Tc cuprate superconductor
• Persistent Fermi Pockets and Robust Electron Pairing in Lightly Doped CuO${}_2$ Planes of Cuprate Superconductors