Identification of a Critical Doping for Charge Order Phenomena in Bi-2212 Cuprates via RIXS

Abstract

Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Recently, signatures of quantum fluctuations associated with charge order (CO) have been inferred from the anomalous enhancement of CO excitations that accompany the reduction of the CO order parameter in the superconducting state. To gain more insight about the interplay between CO and superconductivity, here we investigate the doping dependence of this phenomenon throughout the Bi-2212 cuprate phase diagram using resonant inelastic x-ray scattering (RIXS) at the Cu L3- edge. As doping increases, the CO wavevector decreases, saturating at a commensurate value of 0.25 r.l.u. beyond a characteristic doping pc, where the correlation length becomes shorter than the apparent periodicity (4a0). Such behavior is indicative of the fluctuating nature of the CO; and the proliferation of CO excitations in the superconducting state also appears strongest at pc, consistent with expected behavior at a CO QCP. Intriguingly, pc appears to be near optimal doping, where the superconducting transition temperature Tc is maximal.

This is a submitted version of the manuscript. The revised manuscript is now published on Physical Review B

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• Theory of charge dynamics in bilayer electron system with long-range Coulomb interaction
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• A Theoretical Study of Doping Evolution of Phonons in High-Temperature Cuprate Superconductors
• Spin-stripe order tied to the pseudogap phase in La1.8-xEu0.2SrxCuO4
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• Doping Dependence of Upper Critical Field of High-Tc Cuprate Bi2+xSr2-xCaCu2O8+d Estimated from Irreversibility Field at Zero Temperature
• Valence Transition Theory of the Pressure-Induced Dimensionality Crossover in Superconducting Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$
• Dynamic charge order from strong correlations in the cuprates
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• Observation of Subharmonic Charge-Density-Wave Correlations in La-Based Cuprates
• Probing d-wave superconducting gap of high-$T_{\mathrm{c}}$ cuprate ${\mathrm{Bi}}_2{\mathrm{Sr}}_2{\mathrm{Ca}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{10+\delta }$ by resonant inelastic X-ray scattering