High-energy magnetic excitations from dynamic stripes in LBCO (x=1/8)

Abstract

We use inelastic neutron scattering to study the temperature dependence of magnetic excitations (for energies up to 100 meV) in the cuprate La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$. This compound exhibits stripe order below a temperature of ~50 K; previous measurements have shown that the magnetic excitations of the stripe-ordered phase have an hour-glass-like dispersion, with a saddle point at ~50 meV. Here we compare measurements in the disordered phase taken at 65 and 300 K. At energies on the scale of $k_{\mathrm{B}}T$, there is substantial momentum-broadening of the signal, and the low-energy incommensurate features can no longer be resolved at 300 K. In contrast, there is remarkably little change in the scattered signal for energies greater than $k_{\mathrm{B}}T$. In fact, the momentum-integrated dynamic susceptibility is almost constant with temperature. We suggest that the continuity of higher-energy magnetic excitations is strong evidence for dynamic stripes in the high-temperature, disordered phase. We reconsider the nature of the magnetic dispersion, and we discuss the correspondences between the thermal evolution of magnetic stripe correlations with other electronic properties of the cuprates.

References in corpus (10)

• The Ground State of the Pseudogap in Cuprate Superconductors
• Two energy scales in the spin excitations of the high-T_c superconductor La${}_{2-x}$Sr${}_x$CuO${}_4$
• One- and Two-Triplon Spectra of a Cuprate Ladder
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Resonant magnetic excitations at high energy in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Magnetic excitations in a bond-centered stripe phase: Spin waves far from the semi-classical limit
• Linear Response Theory and the Universal Nature of the Magnetic Excitation Spectrum of the Cuprates
• Charge order, metallic behavior and superconductivity in La_{2-x}Ba_xCuO_4 with x=1/8
• Magnetic Excitation of t-J Model with Quasi-One-Dimensional Fermi Surface -- Possible Relevance to LSCO Systems
• Doped two-leg ladder with ring exchange

Cited by in corpus (14)

• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• Evidence for unusual superconducting correlations coexisting with stripe order in La(1.875)Ba(0.125)CuO(4)
• Cuprate superconductors as viewed through a striped lens
• The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4
• Magneto-optical signatures of a cascade of transitions in La${}_2-x$Ba${}_x$CuO${}_4$
• Quantum Spin Excitations through the metal-to-insulator crossover in $YB{a}_{2}C{u}_3{O}_{6+y}$
• Magnetic field dependence of charge stripe order in La2-xBaxCuO4 (x~1/8)
• High resolution X-ray scattering studies of structural phase transitions in underdoped La${}_{2-x}$Ba${}_x$CuO${}_4$
• Nernst Effect of stripe ordering La${}_{1.8-x}$Eu${}_{0.2}$Sr${}_x$CuO${}_4$
• Modelling Magnetic Fluctuations in the Stripe Ordered State
• Topological Doping and Superconductivity in Cuprates: An Experimental Perspective
• Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly-doped La1.96Sr0.04CuO4
• Evidence for site-centered stripes from magnetic excitations in CuO superconductors
• Magnetic Excitations in the Site-Centered Stripe Phase: Spin Wave Theory of Coupled Three-Leg Ladders