Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly-doped La1.96Sr0.04CuO4

Abstract

Inelastic neutron scattering experiments have been performed on lightly-doped La${}_{1.96}$Sr${}_{0.04}$CuO${}_4$, which shows diagonal incommensurate spin correlations at low temperatures. We previously reported that this crystal, with a single orthorhombic domain, exhibits the "hourglass" dispersion at low energies [Phys. Rev. Lett. 101, 197001 (2008)]. In this paper, we investigate in detail the energy evolution of the magnetic excitations up to 65 meV. It is found that the anisotropic excitations at low energies, dispersing only along the spin modulation direction, crossover to an isotropic, conical dispersion that resembles spin waves in the parent compound La${}_2$CuO${}_4$. The change from two-fold to full symmetry on crossing the waist of the hourglass reproduces behavior first identified in studies of underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$. We discuss the significance of these results.

arXiv comment7 pages, 4 figures

References in corpus (55)

• How to detect fluctuating order in the high-temperature superconductors
• Electronic Liquid Crystal Phases of a Doped Mott Insulator
• Spin waves and electronic interactions in La2CuO4
• Quantum Magnetic Excitations from Stripes in Copper-Oxide Superconductors
• The pseudogap: friend or foe of high Tc?
• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Stripe order, depinning, and fluctuations in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ and La${}_{1.875}$Ba${}_{0.075}$Sr${}_{0.050}$CuO${}_4$
• Mobility of the Doped Holes and the Antiferromagnetic Correlations in Underdoped High-T_c Cuprates
• The Spin Excitation Spectrum in Superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• In-plane anisotropy of spin excitations in the normal and superconducting states of underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$
• Static magnetic correlations near the insulating-superconducting phase boundary in La${}_{2-x}$Sr${}_x$CuO${}_4$
• 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
• From incommensurate to dispersive spin-fluctuations: The high-energy inelastic spectrum in superconducting YBa2Cu3O6.5
• Direct Observation of a One Dimensional Static Spin Modulation in Insulating La1.95Sr0.05CuO4
• Stripe order at low temperatures in La{2-x}Sr{x}NiO4 for 1/3 < x < 1/2
• Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)
• A Comparison of the High-Frequency Magnetic Fluctuations in Insulating and Superconducting La2-xSrxCuO4
• Dynamic Stripes and Resonance in the Superconducting and Normal Phases of YBa2Cu3O6.5 Ortho-II Superconductor
• Universal Dispersive Excitations in the High-Temperature Superconductors
• Spin excitations in fluctuating stripe phases of doped cuprate superconductors
• The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4
• Doping dependence of spin excitations in the stripe phase of high-Tc superconductors
• Low temperature vortex liquid in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$
• Magnetic correlations in La2-xSrxCoO4 studied by neutron scattering : possible evidence for stripe phases
• Spin Waves in Striped Phases
• Spin dynamics of stripes
• Hour-glass magnetic spectrum in an insulating, hole-doped antiferromagnet
• Magnetic Excitations of the Diagonal Incommensurate Phase in Lightly-Doped La2-xSrxCuO4
• Spin dynamics in stripe-ordered La5/3Sr1/3NiO4
• Neutron scattering studies on stripe phases in non-cuprate materials
• High-Energy Spin Dynamics in La${}_{1.69}$Sr${}_{0.31}$NiO${}_4$
• Spin-stripe density varies linearly with hole content in single-layer Bi2201 cuprate
• Theory of incommensurate magnetic correlations across the insulator-superconductor transition in underdoped La_{2-x}Sr_xCuO_4
• Evidence for Charge Glass-like Behavior in Lightly Doped La_{2-x}Sr_{x}CuO_{4} at Low Temperatures
• Emergence of superconductivity from the dynamically heterogeneous insulating state in La_{2-x}Sr_{x}CuO_{4}
• High-energy magnetic excitations from dynamic stripes in LBCO (x=1/8)
• Stripe Structures in the t-t'-J Model
• Spin Dynamics of Half-Doped La3/2Sr1/2NiO4
• Lightly doped La(2-x)Sr(x)CuO(4) as a Lifshitz helimagnet
• Non-Gaussian Noise in the In-Plane Transport of Lightly Doped La_{2-x}Sr_{x}CuO_4: Evidence for a Collective State of Charge Clusters
• Disorder, cluster spin glass, and hour-glass spectra in striped magnetic insulators
• Stripes in cuprate superconductors: Excitations and dynamic dichotomy
• Spin canting as a result of the competition between stripes and spirals in cuprates
• Evidence for charge orbital and spin stripe order in an overdoped manganite
• Absolute measurements of the high-frequency magnetic dynamics in high-Tc superconductors
• Modelling Magnetic Fluctuations in the Stripe Ordered State
• Hourglass dispersion in overdoped single-layered manganites
• Effective action of the weakly doped t-J model and spin-wave excitations in the spin-glass phase of La_{2-x}Sr_xCuO_4
• Evidence for site-centered stripes from magnetic excitations in CuO superconductors
• Hidden Ferronematic Order in Underdoped Cuprates

Cited by in corpus (3)

• Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides La${}_{2-x}$Sr${}_x$CoO${}_4$
• Hour-glass magnetic spectrum in a stripe-less insulating transition metal oxide
• Neutron Scattering Studies of Spin-Phonon Hybridization and Superconducting Spin-Gaps in High Temperature Superconductor $L{a}_{2-x}(Sr,Ba{)}_{x}Cu{O}_4$