High-energy magnetic excitations in overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ studied by neutron and resonant inelastic X-ray scattering

Abstract

We have performed neutron inelastic scattering and resonant inelastic X-ray scattering (RIXS) at the Cu-$L_3$ edge to study high-energy magnetic excitations at energy transfers of more than 100 meV for overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ with $x=0.25$ ($T_c=15$ K) and $x=0.30$ (non-superconducting) using identical single crystal samples for the two techniques. From constant-energy slices of neutron scattering cross-sections, we have identified magnetic excitations up to ~250 meV for $x=0.25$. Although the width in the momentum direction is large, the peak positions along the (pi, pi) direction agree with the dispersion relation of the spin-wave in the non-doped La${}_2$CuO${}_4$ (LCO), which is consistent with the previous RIXS results of cuprate superconductors. Using RIXS at the Cu-$L_3$ edge, we have measured the dispersion relations of the so-called paramagnon mode along both (pi, pi) and (pi, 0) directions. Although in both directions the neutron and RIXS data connect with each other and the paramagnon along (pi, 0) agrees well with the LCO spin-wave dispersion, the paramagnon in the (pi, pi) direction probed by RIXS appears to be less dispersive and the excitation energy is lower than the spin-wave of LCO near (pi/2, pi/2). Thus, our results indicate consistency between neutron inelastic scattering and RIXS, and elucidate the entire magnetic excitation in the (pi, pi) direction by the complementary use of two probes. The polarization dependence of the RIXS profiles indicates that appreciable charge excitations exist in the same energy range of magnetic excitations, reflecting the itinerant character of the overdoped sample. A possible anisotropy in the charge excitation intensity might explain the apparent differences in the paramagnon dispersion in the (pi, pi) direction as detected by the X-ray scattering.

arXiv comment7 pages, 7 figures

References in corpus (19)

• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Quantum Magnetic Excitations from Stripes in Copper-Oxide Superconductors
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Persistence of magnetic excitations in La2-xSrxCuO4 from the undoped insulator to the heavily overdoped non-superconducting metal
• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Two energy scales in the spin excitations of the high-T_c superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Anomalous High-Energy Spin Excitations in La2CuO4
• Magnetic neutron scattering in hole doped cuprate superconductors
• Resonant X-rays at the Cu L-edge as a momentum dependent probe of the magnetic excitation spectrum in cuprates
• Energy and symmetry of $dd$ excitations in undoped layered cuprates measured by Cu $L_3$ resonant inelastic x-ray scattering
• Direct relation between the low-energy spin excitations and superconductivity of overdoped high-$T_c$ superconductors
• Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering
• Asymmetry of collective excitations in electron and hole doped cuprate superconductors
• High-energy spin and charge excitations in electron-doped copper oxide superconductors
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering
• The Persistence of High-Frequency Spin Fluctuations in Overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x$=0.22)
• Magnetic Excitations of the Diagonal Incommensurate Phase in Lightly-Doped La2-xSrxCuO4
• Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates

Cited by in corpus (29)

• Using RIXS to uncover elementary charge and spin excitations in correlated materials
• Doping Dependence of Collective Spin and Orbital Excitations in Spin 1 Quantum Antiferromagnet La${}_{2-x}$Sr${}_x$NiO${}_4$ Observed by X-rays
• Doping dependence of the magnetic excitations in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Observation of a dispersive charge mode in hole-doped cuprates using resonant inelastic x-ray scattering at the oxygen K edge
• A resonant inelastic x-ray scattering study of the spin and charge excitations in the overdoped superconductor La1.77Sr0.23CuO4
• RIXS studies of magnons and bimagnons in the lightly doped cuprate La2-xSrxCuO4
• On the extraction of paramagnon excitations from resonant inelastic X-ray scattering experiments
• Fractional and composite excitations of antiferromagnetic quantum spin trimer chains
• Damped spin excitations in a doped cuprate superconductor with orbital hybridization
• The overdoped end of the cuprate phase diagram
• Local and collective magnetism of EuFe${}_2$As${}_2$
• Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic x-ray scattering
• A unified theory of spin and charge excitations in high-$T_c$ cuprates: Quantitative comparison with experiment and interpretation
• Doping evolution of charge and spin excitations in two-leg Hubbard ladders: comparing DMRG and RPA+FLEX results
• Decrease of d-wave pairing strength in spite of the persistence of magnetic excitations in the overdoped Hubbard model
• Competition between spin ordering and superconductivity near the pseudogap boundary in La2-xSrxCuO4: insights from NMR
• Signatures of pairing in the magnetic excitation spectrum of strongly correlated ladders
• Robust spin and charge excitations throughout high-$T_c$-cuprate phase diagram from incipient Mottness
• Signatures of strong correlation effects in RIXS on Cuprates
• Unravelling the Nature of Spin Excitations Disentangled from Charge Contributions in a Doped Cuprate Superconductor
• Universal collective modes from strong electronic correlations: Modified $1/{\mathcal{N}}_f$ theory with application to high-$T_c$ cuprates
• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• Spin excitations coupled with lattice and charge dynamics in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Collective spin and charge excitations in the $t$-$J$-$U$ model of high-$T_c$ cuprates
• Electron-hole asymmetry of quantum collective excitations in high-$T_c$ copper oxides
• Dynamic Parallel Spin Stripes from the 1/8 anomaly to the End of Superconductivity in La${}_{1.6-x}$Nd${}_{0.4}$Sr${}_x$CuO${}_4$
• Emergence of Fermi-liquid and BCS physics in overdoped cuprates
• Strongly correlated model of acousticlike plasmons persisting across the phase diagram of cuprate superconductors