Resonant Spin Excitation in an Overdoped High Temperature Superconductor
H. He, Y. Sidis, P. Bourges, G. D. Gu, A. Ivanov, N. Koshizuka, B. Liang, C. T. Lin, L. P. Regnault, E. Schoenherr, B. Keimer
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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