Magnetic Excitations of a Half-Filled Tl-based Cuprate

Abstract

Strong electron correlations drive Mott insulator transitions. Yet, there exists no framework to classify Mott insulators by their degree of correlation. Cuprate superconductors, with their tunable doping and rich phase diagrams, offer a unique platform to investigate the evolution of these interactions. However, spectroscopic access to a clean half-filled Mott-insulating state is lacking in compounds with the highest superconducting onset temperature. To fill this gap, we introduce a pristine, half-filled thallium-based cuprate system, Tl${}_2$Ba${}_5$Cu${}_4$O${}_x$. Using high-resolution resonant inelastic x-ray scattering, we probe long-lived magnon excitations and uncover a pronounced kink in the magnon dispersion, marked by a simultaneous change in group velocity and lifetime broadening. Modeling the dispersion within a Hubbard-Heisenberg approach, we extract the interaction strength and compare it with other cuprate systems. Our results establish a cuprate universal relation between electron-electron interaction and magnon zone-boundary dispersion. Superconductivity seems to be optimal at intermediate correlation strength, suggesting an optimal balance between localization and itinerancy.

arXiv comment12 pages, 8 figures, 2 tables

References in corpus (34)

• Complexity in Strongly Correlated Electronic Systems
• Spin waves and electronic interactions in La2CuO4
• Defects in correlated metals and superconductors
• Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Energy gaps in high-transition temperature cuprate superconductors
• Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal
• Doping Evolution of the Underlying Fermi Surface in La2-xSrxCuO4
• Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
• Fermi Surface and Quasiparticle Excitations of overdoped Tl2Ba2CuO6+d by ARPES
• Superconductivity in the Hubbard model and its interplay with charge stripes and next-nearest hopping t'
• Anomalous High-Energy Spin Excitations in La2CuO4
• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Energy and symmetry of $dd$ excitations in undoped layered cuprates measured by Cu $L_3$ resonant inelastic x-ray scattering
• Universal quantum oscillations in the underdoped cuprate superconductors
• Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ
• Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors
• Quantum dynamics and entanglement of spins on a square lattice
• High-Frequency Spin Waves in YBa2Cu3O6.15
• Apical oxygens and correlation strength in electron and hole doped copper oxides
• Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering
• Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
• Persistent paramagnons deep in the metallic phase of Sr${}_{2-x}$La${}_x$IrO${}_4$
• Characterizing the three-orbital Hubbard model with determinant quantum Monte Carlo
• Low energy theory of the t-t'-t''-U Hubbard Model at half-filling: interaction strengths in cuprate superconductors and an effective spin-only description of La_2CuO_4
• Unified quantitative model for magnetic and electronic spectra of the undoped cuprates
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Charge density waves and Fermi-surface reconstruction in the clean overdoped cuprate superconductor Tl2Ba2CuO6+x
• High-Energy Continuum of Magnetic Excitations in the Two-Dimensional Quantum Antiferromagnet Sr2CuO2Cl2
• Band Structure of Overdoped Cuprate Superconductors: Density Functional Theory Matching Experiments
• Damped spin excitations in a doped cuprate superconductor with orbital hybridization
• Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens
• Magnon Splitting Induced by Charge Transfer in the Three-Orbital Hubbard Model
• Decoupling of Static and Dynamic Charge Correlations revealed by Uniaxial Strain in a Cuprate Superconductor