The resonant magnetic mode:: A common feature of high-Tc superconductors

Inelastic neutron scattering experiments in high-T-c cuprates have evidenced a new magnetic excitation present in the superconducting state. In particular, recent experiments on single-layer Tl2Ba2CuO6+delta, performed Dear optimum doping (T-c similar to 90 K), provide evidence of a sharp magnetic resonant mode below Tc, similar to previous reports on the YBCO and BSCCO bilayer systems. This result supports models that ascribe a key role to magnetic excitations in the mechanism of superconductivity. (c) 2005 Elsevier B.V. All rights reserved.