The effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5

Abstract

We have measured the spin fluctuations in the YBa2Cu3O6.5 (YBCO6.5, Tc=59 K) superconductor at high-energy transfers above ~ 100 meV. Within experimental error, the momentum dependence is isotropic at high-energies, similar to that measured in the insulator for two dimensional spin waves, and the dispersion extrapolates back to the incommensurate wave vector at the elastic position. This result contrasts with previous expectations based on measurements around 50 meV which were suggestive of a softening of the spin-wave velocity with increased hole doping. Unlike the insulator, we observe a significant reduction in the intensity of the spin excitations for energy transfers above ~ 100 meV similar to that observed above ~ 200 meV in the YBCO6.35 (Tc=18 K) superconductor as the spin waves approach the zone boundary. We attribute this high energy scale with a second gap and find agreement with measurements of the pseudogap in the cuprates associated with electronic anomalies along the antinodal positions. In addition, we observe a sharp peak at around 400 meV whose energy softens with increased hole doping. We discuss possible origins of this excitation including a hydrogen related molecular excitation and a transition of electronic states between d levels.

(16 pages, 12 figures, to be published in Physical Review B)

References in corpus (23)

• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)
• Two Gaps Make a High Temperature Superconductor?
• Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Electronic Origin of the Inhomogeneous Pairing Interaction in the High-Tc Superconductor Bi2Sr2CaCu2O8+d
• Two energy scales in the spin excitations of the high-T_c superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• Magnetic neutron scattering in hole doped cuprate superconductors
• Modeling the Fermi arc in underdoped cuprates
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Resonant magnetic excitations at high energy in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Observation of a 500meV Collective Mode in La${}_{2-x}$Sr${}_x$CuO${}_4$ and Nd${}_2$CuO${}_4$
• Testing the itinerancy of spin dynamics in superconducting Bi2212
• The Persistence of High-Frequency Spin Fluctuations in Overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x$=0.22)
• The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4
• Spin dynamics near the critical doping in weakly-superconducting underdoped YBa2Cu3O6.35 (Tc=18K)
• Magnetic nature of the 500 meV peak in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ observed with resonant inelastic x-ray scattering at the Cu $K$-edge
• The nodal gap component as a good candidate for the superconducting order parameter in cuprates
• Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering
• High-energy magnetic excitations from dynamic stripes in LBCO (x=1/8)
• Quantum Spin Excitations through the metal-to-insulator crossover in $YB{a}_{2}C{u}_3{O}_{6+y}$
• Magnetic Excitations of Stripes and Checkerboards in the Cuprates
• Incompatibility of modulated checkerboard patterns with the neutron scattering resonance peak in cuprate superconductors
• Antiferromagnetic correlations near the lower edge of superconducting dome in YBCO6+x

Cited by in corpus (35)

• Theory of Intertwined Orders in High Temperature Superconductors
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• High-temperature charge density wave correlations in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ without spin-charge locking
• 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
• Cuprate superconductors as viewed through a striped lens
• Charge ordering in superconducting copper oxides
• Superconductivity, Antiferromagnetism, and Neutron Scattering
• Bimagnon studies in cuprates with Resonant Inelastic X-ray Scattering at the O K edge. I - An assessment on La2CuO4 and a comparison with the excitation at Cu L3 and Cu K edges
• Magnetic field splitting of the spin-resonance in CeCoIn5
• Spin-stripe density varies linearly with hole content in single-layer Bi2201 cuprate
• Kinetic-energy driven superconductivity in cuprate superconductors
• Spin-Orbit Excitons in CoO
• Neutron scattering measurements of $dd$ and spin-orbit excitations below the Mott-Hubbard gap in CoO
• Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Doping-Dependent Raman Resonance in the Model High-Temperature Superconductor HgBa2CuO4+d
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
• Stripes and Superconductivity in Cuprates
• Single to multi quasiparticle excitations in the itinerant helical magnet CeRhIn${}_5$
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• Magnetic Fluctuations and the Spin-Orbit Interaction in Mott Insulating CoO
• Superconducting pairing and the pseudogap in nematic striped La2-xSrxCuO4
• Neutron Scattering and Its Application to Strongly Correlated Systems
• Crossover of the high-energy spin fluctuations from collective triplons to localized magnetic excitations in doped Sr14-xCaxCu24O41 cuprate ladders
• Relaxing Kondo screened Kramers-doublets in CeRhSi${}_3$
• From mean-field localized magnetism to itinerant spin fluctuations in the "Non-metallic metal" - FeCrAs
• Dynamical spin response in cuprate superconductors from low-energy to high-energy
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)
• Spin excitation spectrum of high-temperature cuprate superconductors from finite cluster simulations
• Gapless spin excitations in superconducting La${}_{2-x}$Ca${}_{1+x}$Cu${}_2$O${}_6$ with $T_c$ up to 55 K
• Momentum and doping dependence of spin excitations in electron-doped cuprate superconductors
• Dynamics of magnetic collective modes in the square and triangular lattice Mott insulators at finite temperature