Magnetic resonance in the model high-temperature superconductor HgBa2CuO4+δ

Inelastic neutron-scattering measurements of single-CuO2-layer HgBa2CuO4+delta reveal an antiferromagnetic resonance with energy omega(r) = 56 meV (approximate to 6.8k(B)T(c)) below the superconducting transition temperature T-c approximate to 96 K. The resonance is energy-resolution limited and exhibits an intrinsic momentum width of about 0.2 angstrom(-1), consistent with prior work on several other cuprates. The rather large value of omega(r) is identical to the characteristic energy of the electron-boson spectral density obtained from recent optical conductivity work, consistent with the notion that the charge carriers are strongly coupled to magnetic fluctuations.