Abstract
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 Tl 2Ba 2CuO 6+ δ , performed near optimum doping ( T c ∼ 90 K), provide evidence of a sharp magnetic resonant mode below T c, 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.
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