Momentum and doping dependence of spin excitations in electron-doped cuprate superconductors

Abstract

Superconductivity in copper oxides emerges on doping holes or electrons into their Mott insulating parent compounds. The spin excitations are thought to be the mediating glue for the pairing in superconductivity. Here the momentum and doping dependence of the dynamical spin response in the electron-doped cuprate superconductors is studied based on the kinetic-energy-driven superconducting mechanism. It is shown that the dispersion of the low-energy spin excitations changes strongly upon electron doping, however, the hour-glass-shaped dispersion of the low-energy spin excitations appeared in the hole-doped side is absent in the electron-doped case due to the electron-hole asymmetry. In particular, the commensurate resonance appears in the superconducting-state with the resonance energy that correlates with the dome-shaped doping dependence of the superconducting gap. Moreover, the spectral weight and dispersion of the high-energy spin excitations in the superconducting-state are comparable with those in the corresponding normal-state, indicating that the high-energy spin excitations do not play an important part in the pair formation.

arXiv comment9 pages, 6 figures, added discussions, accepted for publication in Journal of Low Temperature Physics. arXiv admin note: text overlap with arXiv:1405.7448

References in corpus (38)

• Correlated Electrons in High Temperature Superconductors
• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• Progress and perspectives on the electron-doped cuprates
• Spin waves and electronic interactions in La2CuO4
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Evolution of the resonance and incommensurate spin fluctuations in superconducting YBa${}_2$Cu${}_3$O${}_{6+x}$
• Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal
• The Spin Excitation Spectrum in Superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Two-Dimensional Geometry of Spin Excitations in the High Temperature Superconductor YBa2Cu3O6+x
• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Spin Susceptibility in Underdoped $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6+\mathbf{x}}$
• Slave Boson Approach to The Neutron Scattering in YBCO Superconductors
• Universal relation between magnetic resonance and superconducting gap in unconventional superconductors
• Direct Observation of Non-Monotonic dx2-y2-Wave Superconducting Gap in Electron-Doped High-Tc Superconductor Pr0.89LaCe0.11CuO4
• Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering
• Asymmetry of collective excitations in electron and hole doped cuprate superconductors
• Commensurate spin dynamics in the superconducting state of an electron-doped cuprate superconductor
• High-energy spin and charge excitations in electron-doped copper oxide superconductors
• Kinetic energy driven superconductivity in doped cuprates
• Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering
• Testing the itinerancy of spin dynamics in superconducting Bi2212
• Theory of electron-hole asymmetry in doped {\em CuO${}_2$} planes
• Fermion-Spin Transformation to Implement the Charge-Spin Separation
• High-energy magnetic excitations in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$: Towards a unified description of the electronic and magnetic degrees of freedom in the cuprates
• The magnetic nature of superconductivity in doped cuprates
• Insights into the High Temperature Superconducting Cuprates from Resonant Inelastic X-ray Scattering
• The resonant magnetic mode: a common feature of high-$T_C$ superconductors
• Doping Dependence of Bilayer Resonant Spin Excitations in $(\mathbf{Y},\mathbf{Ca})\mathbf{B}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6+\mathbf{x}}$
• High Energy Spin Excitations in Electron-Doped Superconducting Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_{4-\delta }$ with $T_c=21$ K
• Kinetic-energy driven superconductivity in cuprate superconductors
• The effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5
• Resonance in Optimally Electron-Doped Superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-\delta }$
• Evolution of the low energy spin dynamics in electron-doped high-transition temperature superconductor Pr0.88LaCe0.12CuO4-d
• The resonance peak in the electron-doped cuprate superconductors
• Electron-Spin Excitation Coupling in an Electron Doped Copper Oxide Superconductor
• Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cuprates
• Doping and energy evolution of spin dynamics in the electron-doped cuprate superconductor Pr${}_{0.88}$LaCe${}_{0.12}$CuO${}_{4-\delta }$
• Dynamical spin response in cuprate superconductors from low-energy to high-energy