Hourglass dispersion and resonance of magnetic excitations in the superconducting state of the single-layer cuprate HgBa2CuO4+δ near optimal doping

Abstract

We use neutron scattering to study magnetic excitations near the antiferromagnetic wave vector in the underdoped single-layer cuprate HgBa2CuO4+δ (superconducting transition temperature Tc ~ 88 K, pseudogap temperature T* ~ 220 K). The response is distinctly enhanced below T* and exhibits a Y-shaped dispersion in the pseudogap state, whereas the superconducting state features an X-shaped (hourglass) dispersion and a further resonance-like enhancement. A large spin gap of about 40 meV is observed in both states. This phenomenology is reminiscent of that exhibited by bilayer cuprates. The resonance spectral weight, irrespective of doping and compound, scales linearly with the putative binding energy of a spin-exciton described by an itinerant-spin formalism.

6 pages, 3 figures

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Cited by in corpus (19)

• Cuprate superconductors as viewed through a striped lens
• Effective SU(2) theory for the pseudogap state
• Strongly-overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$: Evidence for Josephson-coupled grains of strongly-correlated superconductor
• Nature of the spin resonance mode in CeCoIn${}_5$
• Ubiquitous Charge Order Correlations in High-Temperature Superconducting Cuprates
• Phonon spectrum of underdoped ${\text{HgBa}}_2{\text{CuO}}_{4+\delta }$ investigated by neutron scattering
• Phase diagram and neutron spin resonance of superconducting NaFe${}_{1-x}$Cu${}_x$As
• Coexistence of Two Components in Magnetic Excitations of La${}_{2-x}$Sr${}_x$CuO${}_4$ ($x$ = 0.10 and 0.16)
• Three interaction energy scales in single-layer high-T${}_C$ cuprate HgBa${}_2$CuO${}_{4+\delta }$
• Unusual Low-Energy Collective Charge Excitations in High-$T_c$ Cuprate Superconductors
• One- and two-particle correlation functions in the cluster perturbation theory for cuprates
• Nanoscale structural correlations in a model cuprate superconductor
• Spin excitations coupled with lattice and charge dynamics in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Thermal Hall Effect and Neutral Spinons in a Doped Mott Insulator
• Entanglement in the pseudogap regime of cuprate superconductors
• Gapless spin excitations in superconducting La${}_{2-x}$Ca${}_{1+x}$Cu${}_2$O${}_6$ with $T_c$ up to 55 K
• Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
• Empirical case for two pseudogaps in cuprate superconductors
• Strain-induced structural change and nearly-commensurate diffuse scattering in the model high-temperature superconductor HgBa${}_2$CuO${}_{4+\delta }$