Resonant Spin Excitation in an Overdoped High Temperature Superconductor
Abstract
An inelastic neutron scattering study of overdoped Bi2Sr2CaCu2O8+δ $ (Tc = 83 K) has revealed a resonant spin excitation in the superconducting state. The mode energy is Eres=38 meV, significantly lower than in optimally doped Bi2Sr2CaCu2O8+δ (Tc = 91 K, E res =43 meV). This observation, which indicates a constant ratio Eres /kB Tc 5.4, helps resolve a long-standing controversy about the origin of the resonant spin excitation in high-temperature superconductors.
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